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, 2010	$ 906,957	$ 392,705	$ (39,058)	$ 1,260,604	$ 25,040	$ 1,285,644
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2010	105,592
Net income (loss), including noncontrolling interests		129,939		129,939	3,098	133,037
Foreign currency translation adjustments			(1,002)	(1,002)		(1,002)
Unrealized gain (loss) on hedges, net			30,043	30,043		30,043
Stock compensation expense	8,418			8,418		8,418
Stock repurchases, value	(6,502)			(6,502)		(6,502)
Stock repurchases, 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		(46,334)		(46,334)	3,178	(43,156)
Foreign currency translation adjustments			7,291	7,291		7,291
Unrealized gain (loss) on hedges, net			(12,941)	(12,941)		(12,941)
Distributions to noncontrolling interest					(5,287)	(5,287)
Equity component of debt discount on Convertible Senior Note due 2032	22,419			22,419		22,419
Convertible preferred stock conversion, value (Note 2)	1,000			1,000		1,000
Convertible preferred stock conversion, shares	362
Stock compensation expense	7,361			7,361		7,361
Stock repurchases, value	(6,415)			(6,415)		(6,415)
Stock repurchases, 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
Net income (loss), including noncontrolling interests		109,922		109,922	3,127	113,049
Foreign currency translation adjustments			4,970	4,970		4,970
Unrealized gain (loss) on hedges, net			(9,991)	(9,991)		(9,991)
Distributions to noncontrolling interest					(4,097)	(4,097)
Equity component of debt discount on Convertible Senior Note due 2032	49			49		49
Stock compensation expense	7,510			7,510		7,510
Stock repurchases, value	(8,855)			(8,855)		(8,855)
Stock repurchases, shares	(390)
Activity in company stock plans, net and other, value	1,842			1,842		1,842
Activity in company stock plans, net and other, shares	267
Excess tax from stock-based compensation	219			219		219
Balance at Dec. 31, 2013	$ 933,507	$ 586,232	$ (20,688)	$ 1,499,051	$ 25,059	$ 1,524,110
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2013	105,640