Goodwill and Intangible Assets, Net (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Changes in gross carrying amount of finite-lived intangible assets
Gross Carrying Amount	$ 67,862	$ 71,722	$ 67,737
Accumulated Amortization	(28,134)	(21,086)	(25,964)
Net Carrying Amount	39,728	50,636	41,773
Amortization expense of intangible assets	2,170	2,000
Estimated future amortization of definite-lived intangible assets
Remaining nine months of 2014	4,866
2015	6,068
2016	5,877
2017	4,066
2018	3,042
2019	3,014
Thereafter	7,089
Total	34,022
North America
Changes in gross carrying amount of finite-lived intangible assets
Gross Carrying Amount	34,495	40,551	34,520
Accumulated Amortization	(17,278)	(13,313)	(15,909)
Net Carrying Amount	17,217	27,238	18,611
Europe
Changes in gross carrying amount of finite-lived intangible assets
Gross Carrying Amount	33,367	31,171	33,217
Accumulated Amortization	(10,856)	(7,773)	(10,055)
Net Carrying Amount	$ 22,511	$ 23,398	$ 23,162