Other Comprehensive Income Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ (52,847)	$ 23,164	$ (24,145)	$ 123,956
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(1,365)	(361)	(1,365)	(306)
Net unrealized gain (loss) on a nonderivative net investment hedging instrument	0	(2,343)	0	(14,923)
Net hedging (gain) loss reclassified into net income (loss)	0	2,149	0	4,477
Pension plan benefits liability adjustment	19	33	38	(745)
Total other comprehensive income (loss), before tax	(54,193)	22,642	(25,472)	112,459
Tax (provision) benefit [Abstract]
Total other comprehensive income (loss), before tax	476	(67)	315	(412)
Total other comprehensive income (loss), before tax	516	137	516	142
Net unrealized gain (loss) on a nonderivative net investment hedging instrument	0	891	0	5,661
Net hedging (gain) loss reclassified into net income (loss)	0	(817)	0	(1,703)
Pension plan benefits liability adjustment	3	(9)	7	217
Total other comprehensive income (loss) tax (provision) benefit	995	135	838	3,905
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(52,371)	23,097	(23,830)	123,544
Net-of-tax amount [Abstract]
Foreign currency translation adjustments	(52,331)	23,238	(23,790)	124,057
Net unrealized gain (loss) on derivative instruments, designated as cash flow hedges	(849)	(224)	(849)	(164)
Net unrealized gain (loss) on a nonderivative net investment hedging instrument	0	(1,452)	0	(9,262)
Net hedging (gain) loss reclassified into net income	0	1,332	0	2,774
Pension plan benefits liability adjustment	22	24	45	(528)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(53,198)	22,777	(24,634)	116,364
Total other comprehensive income (loss), net of tax	$ (53,158)	$ 22,918	$ (24,594)	$ 116,877