CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2018	$ 666,901	$ 441,369	$ 1,812,682	$ (2,354,617)	$ 1,626,693	$ (859,226)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(176,296)				(176,296)
Other comprehensive income (loss), net of tax	21,292					21,292
Issuance of treasury stock for restricted stock units vesting	(387)		(1,829)	1,442
Share-based compensation	11,865		11,865
Ending balance at Mar. 31, 2019	523,375	441,369	1,822,718	(2,353,175)	1,450,397	(837,934)
Beginning balance at Dec. 31, 2019	491,714	441,369	1,825,569	(2,318,921)	1,413,181	(869,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(210,741)				(210,741)
Other comprehensive income (loss), net of tax	(136,399)					(136,399)
Issuance of treasury stock for restricted stock units vesting	(966)		(3,777)	2,811
Share-based compensation	14,275		14,275
Ending balance at Mar. 31, 2020	$ 157,883	$ 441,369	$ 1,836,067	$ (2,316,110)	$ 1,202,440	$ (1,005,883)