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, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Allowance for bad debts $ 11,137 $ 12,853
Accumulated depreciation and amortization on property, plant and equipment $ 1,180,485 $ 1,136,024