CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss ("AOCI") [Member]	Treasury Stock [Member]	Stockholders' Equity [Member]	Noncontrolling Interest ("NCI") [Member]
Beginning Balance at Dec. 31, 2014	$ 1,539,114	$ 245,210	$ 1,676,815	$ (239,572)	$ (97,808)	$ (96,441)	$ 1,488,204	$ 50,910
Beginning Balance (in shares) at Dec. 31, 2014		245,209,850
Net income (loss)	1,642			(2,981)			(2,981)	4,623
Other comprehensive income (loss), net of tax	3,704				3,784		3,784	(80)
Exercise of stock options	680	$ 196	484				680
Exercise of stock options (in shares)		196,340
Share vesting		$ 1,282	(1,282)
Share vesting (in shares)		1,282,118
Stock-based compensation charges	9,143		8,330			813	9,143
Acquisition of noncontrolling interest	(24)		48				48	(72)
Purchase of treasury shares	(1,453)	$ (5)				(1,448)	(1,453)
Purchase of treasury shares (in shares)		(5,561)
Ending Balance at Jun. 30, 2015	$ 1,552,806	$ 246,683	$ 1,684,395	$ (242,553)	$ (94,024)	$ (97,076)	$ 1,497,425	$ 55,381
Ending Balance (in shares) at Jun. 30, 2015		246,199,889