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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Mar. 31, 2013
Statement of Financial Position [Abstract]      
Allowance for doubtful accounts $ 1,988 $ 1,963  
Property, plant and equipment, accumulated depreciation and amortization $ 756,305 $ 724,486  
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01  
Preferred stock shares authorized (in shares) 20,000,000 20,000,000  
Preferred stock shares outstanding (in shares) 0 0  
Common stock par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Common stock shares authorized (in shares) 200,000,000 200,000,000  
Common stock shares issued (in shares) 46,767,164 46,767,164  
Treasury stock, shares held (in shares) 8,167,623 5,088,434