Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for bad debts $ 8,019 $ 8,259
Accumulated depreciation and amortization on property, plant and equipment 1,286,705 1,320,644
Debt Issuance Costs $ 8,272 $ 8,674