Quarterly report pursuant to Section 13 or 15(d)

Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Statement of Comprehensive Income (Loss) (Details)

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Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Statement of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) $ (13,934) $ 15,837 $ (10,156) $ 3,445
Currency translation difference on related borrowings 647 336 (1,023) (468)
Currency translation difference on foreign currency net investments 1,723 (188) 874 511
Total other comprehensive income (loss), net of tax: 2,370 148 (149) 43
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (11,659) 15,905 (10,794) 3,254
Comprehensive (income) attributable to noncontrolling interest (95) (80) (489) (234)
Comprehensive income (loss) attributable to controlling interest (11,564) 15,985 (10,305) 3,488
Parent [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (14,029) 15,681 (10,807) 3,132
Currency translation difference on related borrowings 0 0 0 0
Currency translation difference on foreign currency net investments 0 0 0 0
Total other comprehensive income (loss), net of tax: 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (14,029) 15,681 (10,807) 3,132
Comprehensive (income) attributable to noncontrolling interest 0 0 0 0
Comprehensive income (loss) attributable to controlling interest (14,029) 15,681 (10,807) 3,132
Guarantor [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (7,187) 22,148 (4,868) 34,191
Currency translation difference on related borrowings 0 0 0 0
Currency translation difference on foreign currency net investments 0 0 0 0
Total other comprehensive income (loss), net of tax: 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (7,187) 22,148 (4,868) 34,191
Comprehensive (income) attributable to noncontrolling interest 0 0 0 0
Comprehensive income (loss) attributable to controlling interest (7,187) 22,148 (4,868) 34,191
Non-Guarantor [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (1,110) (1,333) 6,116 (2,729)
Currency translation difference on related borrowings 647 336 (1,023) (468)
Currency translation difference on foreign currency net investments 1,723 (188) 874 511
Total other comprehensive income (loss), net of tax: 2,370 148 (149) 43
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 1,165 (1,265) 5,478 (2,920)
Comprehensive (income) attributable to noncontrolling interest (95) (80) (489) (234)
Comprehensive income (loss) attributable to controlling interest 1,260 (1,185) 5,967 (2,686)
Eliminations [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) 8,392 (20,659) (597) (31,149)
Currency translation difference on related borrowings 0 0 0 0
Currency translation difference on foreign currency net investments 0 0 0 0
Total other comprehensive income (loss), net of tax: 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 8,392 (20,659) (597) (31,149)
Comprehensive (income) attributable to noncontrolling interest 0 0 0 0
Comprehensive income (loss) attributable to controlling interest $ 8,392 $ (20,659) $ (597) $ (31,149)