Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical)

v3.10.0.1
CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Statement of Financial Position [Abstract]    
Allowance for bad debts | $ $ 7,549 $ 7,564
Accumulated depreciation and amortization on property, plant and equipment | $ 1,340,963 1,343,105
Debt issuance costs | $ $ 6,160 $ 7,029
Preferred stock, par value (in dollars per share) | $ / shares $ 1 $ 1
Preferred stock, shares authorized 1,942,000 1,942,000
Preferred dividend percentage 7.25% 7.25%
Preferred stock, shares issued 500,000 500,000
Preferred stock, shares outstanding 500,000 500,000
Common stock, par value (in dollars per share) | $ / shares $ 0.166667 $ 0.166667
Common stock, shares authorized 18,666,667 18,666,667
Common stock, shares issued 9,319,722 9,262,382
Common stock, shares outstanding 9,319,722 9,262,382