CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common stock [Member]	Paid-in capital [Member]	Treasury stock [Member]	Accumulated other comprehensive income (loss) [Member]	Retained earnings (deficit) [Member]	Total
Balance, beginning of period at Dec. 31, 2013	$ 340,047	$ 1,661,269	$ (64,435)	$ (117,726)	$ (1,074,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income					105,504	$ 105,504
Net common stock issued under share-based compensation plans	0	0
Reissuance of treasury stock, net		(6,680)	31,498		(29,790)
Tax benefit from share-based compensation		0
Equity compensation		4,072
Other comprehensive (loss) income				82,473		82,473
Balance, end of period at Jun. 30, 2014	340,047	1,658,661	(32,937)	(35,253)	(998,903)	931,615
Balance, beginning of period at Dec. 31, 2014	340,047	1,663,592	(32,937)	(81,341)	(852,458)	1,036,903
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income					246,730	246,730
Net common stock issued under share-based compensation plans	32	(32)
Reissuance of treasury stock, net		(7,181)	29,575		(29,496)
Tax benefit from share-based compensation		2,568
Equity compensation		5,984
Other comprehensive (loss) income				(46,799)		(46,799)
Balance, end of period at Jun. 30, 2015	$ 340,079	$ 1,664,931	$ (3,362)	$ (128,140)	$ (635,224)	$ 1,238,284