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Guarantor Subsidiaries (Consolidating Balance Sheet Parenthetical) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2013
Guarantor Subsidiaries [Abstract]      
Accounts receivable - trade, allowance for doubtful accounts $ 1,963 $ 4,456  
Property, plant and equipment, accumulated depreciation and amortization $ 724,486 $ 663,067  
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01  
Preferred stock shares authorized 20,000,000 20,000,000  
Preferred stock shares outstanding 0 0  
Common stock par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Common stock shares authorized 200,000,000 200,000,000  
Common stock shares issued 46,767,164 46,767,164  
Treasury stock, shares 5,088,434 1,056,689