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, 2011	$ 908,776	$ 522,644	$ (10,017)	$ 1,421,403	$ 28,138	$ 1,449,541
Balance, shares at Dec. 31, 2011	105,530
Net income (loss)		(46,334)		(46,334)	3,178	(43,156)
Foreign currency translation adjustments			7,291	7,291		7,291
Unrealized loss on hedges, net			(12,941)	(12,941)		(12,941)
Distributions to noncontrolling interests					(5,287)	(5,287)
Equity component of debt discount on Convertible Senior Notes due 2032	22,419			22,419		22,419
Convertible preferred stock conversion, value	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
Balance, shares at Dec. 31, 2012	105,763
Net income (loss)		109,922		109,922	3,127	113,049
Foreign currency translation adjustments			4,970	4,970		4,970
Unrealized loss on hedges, net			(9,991)	(9,991)		(9,991)
Distributions to noncontrolling interests					(4,097)	(4,097)
Equity component of debt discount on Convertible Senior Notes 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
Balance, shares at Dec. 31, 2013	105,640
Net income (loss)		195,047		195,047	503	195,550
Foreign currency translation adjustments			(19,464)	(19,464)		(19,464)
Unrealized loss on hedges, net			(22,100)	(22,100)		(22,100)
Distributions to noncontrolling interests					(1,018)	(1,018)
Acquisition of noncontrolling interests	2,898			2,898	(24,544)	(21,646)
Stock compensation expense	2,176			2,176		2,176
Stock repurchases, value	(7,698)			(7,698)		(7,698)
Stock repurchases, shares	(321)
Activity in company stock plans, net and other, value	3,496			3,496		3,496
Activity in company stock plans, net and other, shares	267
Excess tax from stock-based compensation	68			68		68
Balance at Dec. 31, 2014	$ 934,447	$ 781,279	$ (62,252)	$ 1,653,474		$ 1,653,474
Balance, shares at Dec. 31, 2014	105,586