Intangible Assets Summary of Intangible Asset Account Activity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Customer contracts and relationships [Member]	Dec. 31, 2013 Customer contracts and relationships [Member]
Intangible Assets [Line Items]
Beginning balance, intangible assets, gross	$ 804,281	$ 802,540	$ 290,198	$ 291,185
Effect of change in exchange rates	(2,073)	(20,624)
Ending balance, intangible assets, gross	$ 802,208	$ 781,916	$ 290,198	$ 291,185