CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock Par Value [Member]	Capital in Excess of Par Value [Member]	Retained Earnings/(Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) ("AOCI") [Member]	Treasury Stock [Member]	Stockholder's Equity [Member]	Noncontrolling Interest ("NCI") [Member]
Beginning Balance at Dec. 31, 2015					$ (93,955)
Net income (loss)	$ (2,444)
Other comprehensive income (loss), net of tax	27,453				27,466
Ending Balance at Mar. 31, 2016					(66,489)
Beginning Balance at Dec. 31, 2016	1,595,468	$ 249,690	$ 1,695,119	$ (226,767)	(66,895)	$ (94,957)	$ 1,556,190	$ 39,278
Net income (loss)	24,195			21,916			21,916	2,279
Other comprehensive income (loss), net of tax	2,393				2,411		2,411	(18)
Common stock issued		2,587	(2,587)
Stock-based compensation charges	3,463		3,463				3,463
Purchase of treasury shares	(6,614)					(6,614)	(6,614)
Retirement of common stock		(787)	(4,831)			5,618
Ending Balance at Mar. 31, 2017	$ 1,618,905	$ 251,490	$ 1,691,164	$ (204,851)	$ (64,484)	$ (95,953)	$ 1,577,366	$ 41,539