Consolidated Statements Of Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2009	$ 907,691	$ 519,807	$ (22,241)	$ 1,405,257	$ 22,205	$ 1,427,462
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2009	104,281
Net income (loss), including noncontrolling interests		(126,988)		(126,988)	2,835	(124,153)
Foreign currency translation adjustments			(10,005)	(10,005)		(10,005)
Unrealized gain (loss) on hedges, net			(7,699)	(7,699)		(7,699)
Unrealized loss on investment available for sale			887	887		887
Convertible preferred stock dividends		(114)		(114)		(114)
Convertible preferred stock conversion, value (Note 10)	5,000			5,000		5,000
Convertible preferred stock conversion, shares	1,807
Stock compensation expense	9,217			9,217		9,217
Stock repurchase, value	(11,680)			(11,680)		(11,680)
Stock repurchase, shares	(1,016)
Activity in company stock plans, net and other, value	674			674		674
Activity in company stock plans, net and other, shares	520
Excess tax from stock-based compensation	(3,945)			(3,945)		(3,945)
Balance at Dec. 31, 2010	906,957	392,705	(39,058)	1,260,604	25,040	1,285,644
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2010	105,592
Net income (loss), including noncontrolling interests		129,979		129,979	3,098	133,077
Foreign currency translation adjustments			(1,002)	(1,002)		(1,002)
Unrealized gain (loss) on hedges, net			30,043	30,043		30,043
Convertible preferred stock dividends		(40)		(40)		(40)
Stock compensation expense	8,418			8,418		8,418
Stock repurchase, value	(6,502)			(6,502)		(6,502)
Stock repurchase, shares	(497)
Activity in company stock plans, net and other, value	916			916		916
Activity in company stock plans, net and other, shares	435
Excess tax from stock-based compensation	(1,013)			(1,013)		(1,013)
Balance at Dec. 31, 2011	908,776	522,644	(10,017)	1,421,403	28,138	1,449,541
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2011	105,530
Net income (loss), including noncontrolling interests		(46,297)		(46,297)	3,178	(43,119)
Foreign currency translation adjustments			7,291	7,291		7,291
Unrealized gain (loss) on hedges, net			(12,941)	(12,941)		(12,941)
Dividend payment					(5,287)	(5,287)
Equity component of debt discount on Convertible Senior Note due 2032	22,419			22,419		22,419
Convertible preferred stock dividends		(37)		(37)		(37)
Convertible preferred stock conversion, value (Note 10)	1,000			1,000		1,000
Convertible preferred stock conversion, shares	362
Stock compensation expense	7,361			7,361		7,361
Stock repurchase, value	(6,415)			(6,415)		(6,415)
Stock repurchase, shares	(405)
Activity in company stock plans, net and other, value	787			787		787
Activity in company stock plans, net and other, shares	276
Excess tax from stock-based compensation	(1,186)			(1,186)		(1,186)
Balance at Dec. 31, 2012	$ 932,742	$ 476,310	$ (15,667)	$ 1,393,385	$ 26,029	$ 1,419,414
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2012	105,763