CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Pension & Other Postretirement Benefits [Member]	Cumulative Translation Adjustment [Member]	Unrealized Gains (Losses) on Hedges [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2010	$ 816,784	$ 89	$ 776,918	$ 71,083	$ (71,836)	$ 42,067	$ (26,152)	$ 24,615
Beginning Balance, shares at Dec. 31, 2010		88,611
Net income	38,074			34,168				3,906
Share-based compensation	6,891		6,891
Exercise of stock options	312		312
Exercise of stock options, shares		27
Issuance of restricted stock, shares		6
Cancellation of restricted stock, shares		(40)
Dividends paid	(2,800)							(2,800)
Net foreign currency translation adjustment	(4,383)					(4,382)		(1)
Unrealized hedging gains (losses), net of income tax expense (benefit)	(49,223)						(49,223)
Reclassification of realized (gains) losses to net income, net of income tax expense (benefit)	25,280						25,280
Ending Balance at Oct. 08, 2011	830,935	89	784,121	105,251	(71,836)	37,685	(50,095)	25,720
Ending Balance, shares at Oct. 08, 2011		88,604
Beginning Balance at Dec. 31, 2011	818,421	89	786,355	109,442	(94,708)	30,346	(39,020)	25,917
Beginning Balance, shares at Dec. 31, 2011	88,961	88,952
Net income	68,819			65,176				3,643
Share-based compensation	9,448		9,448
Exercise of stock options	147		147
Exercise of stock options, shares		15
Cancellation of restricted stock, shares		(6)
Dividends paid	(1,467)							(1,467)
Disposal of noncontrolling interest	(714)							(714)
Net foreign currency translation adjustment	7,405					7,402		3
Unrealized hedging gains (losses), net of income tax expense (benefit)	26,116						26,116
Reclassification of realized (gains) losses to net income, net of income tax expense (benefit)	45						45
Ending Balance at Oct. 06, 2012	$ 928,220	$ 89	$ 795,950	$ 174,618	$ (94,708)	$ 37,748	$ (12,859)	$ 27,382
Ending Balance, shares at Oct. 06, 2012	88,961	88,961