CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2014	$ 627,318	$ 941	$ 752,375	$ (41,015)	$ (84,983)
Balance (in shares) at Dec. 31, 2014		94,080,840
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of tax impact of share-based compensation (in shares)		378,878
Issuance of common stock, net of tax impact of share-based compensation	(959)	$ 4	(963)
Share-based compensation expense	6,548		6,548
Repurchase of common stock (in shares)		(3,165,582)
Repurchase of common stock	(53,010)	$ (32)	(52,978)
Net income (loss)	(26,988)			(26,988)
Dividends	(20,009)		(20,009)
Other comprehensive income (loss):
Change in fair value of derivative instruments, net of tax	(87)				(87)
Cumulative translation adjustment	(1,169)				(1,169)
Pension and other postretirement benefit liability adjustment, net of tax	4,409				4,409
Balance (in shares) at Sep. 30, 2015		91,294,136.000
Balance at Sep. 30, 2015	536,053	$ 913	684,973	(68,003)	(81,830)
Balance at Dec. 31, 2015	$ 545,504	$ 914	679,916	(49,523)	(85,803)
Balance (in shares) at Dec. 31, 2015	91,428,274	91,428,274
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of tax impact of share-based compensation (in shares)		384,911
Issuance of common stock, net of tax impact of share-based compensation	$ (1,958)	$ 4	(1,962)
Share-based compensation expense	6,496		6,496
Repurchase of common stock (in shares)		(1,371,185)
Repurchase of common stock	(25,000)	$ (14)	(24,986)
Net income (loss)	87,098			87,098
Dividends	(24,904)		(8,390)	(16,514)
Other comprehensive income (loss):
Cumulative translation adjustment	(1,576)				(1,576)
Pension and other postretirement benefit liability adjustment, net of tax	$ 4,229				4,229
Balance (in shares) at Sep. 30, 2016	90,442,000	90,442,000
Balance at Sep. 30, 2016	$ 589,889	$ 904	$ 651,074	$ 21,061	$ (83,150)