Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Accumulated Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2012	$ (183,347)
Other comprehensive income	26,932		37,069
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of March 31, 2013	(158,043)
Income tax provision	19,222		27,248
Cash Flow Hedges [Member]
Accumulated Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2012	(4,780)
Other comprehensive income before reclassifications	(1,044)
Amounts Reclassified From Accumulated Other Comprehensive Income Loss	350	[1]
Other comprehensive income	(694)
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of March 31, 2013	(5,474)
Income tax provision	100
Foreign Currency Translation [Member]
Accumulated Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2012	(202,509)
Other comprehensive income before reclassifications	27,427
Other comprehensive income	27,427
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of March 31, 2013	(175,082)
Treasury Rate Lock [Member]
Accumulated Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2012	(3,827)
Amounts Reclassified From Accumulated Other Comprehensive Income Loss	199
Other comprehensive income	199
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of March 31, 2013	(3,628)
Total Company [Member]
Accumulated Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2012	(211,116)
Other comprehensive income before reclassifications	26,383
Amounts Reclassified From Accumulated Other Comprehensive Income Loss	549	[1]
Other comprehensive income	26,932
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of March 31, 2013	$ (184,184)

[1] Losses on cash flow hedges have been reclassified into interest expense in the accompanying condensed consolidated statements of operations. The tax effect of $0.1 million is included in income tax expense.