Consolidated Statements of Stockholders' Deficit - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2018		83,886
Beginning balance at Dec. 31, 2018	$ (114,310)	$ 130	$ (1,725,349)	$ 1,007,827	$ 613,637	$ (10,555)
Increase (Decrease) in Stockholders' Equity
Comprehensive income	(16,052)				(15,262)	(790)
Restricted stock awards (in shares)		121
Restricted stock awards	0
Minimum tax withholding requirements (in shares)		(41)
Minimum tax withholding requirements	(120)			(120)
Stock-based compensation	1,334			1,334
Ending balance (in shares) at Mar. 31, 2019		83,966
Ending balance at Mar. 31, 2019	(189,084)	$ 130	(1,725,349)	1,009,041	538,439	(11,345)
Beginning balance (in shares) at Dec. 31, 2019		84,564
Beginning balance at Dec. 31, 2019	(207,263)	$ 131	(1,725,349)	1,012,076	518,605	(12,726)
Increase (Decrease) in Stockholders' Equity
Comprehensive income	(196,445)				(200,086)	3,641
Restricted stock awards (in shares)		68
Restricted stock awards	0
Minimum tax withholding requirements (in shares)		(24)
Minimum tax withholding requirements	(54)			(54)
Stock-based compensation	1,372			1,372
Ending balance (in shares) at Mar. 31, 2020		84,608
Ending balance at Mar. 31, 2020	$ (402,390)	$ 131	$ (1,725,349)	$ 1,013,394	$ 318,519	$ (9,085)