Goodwill and Intangible Assets, Net (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Changes in gross carrying amount of finite-lived intangible assets
Gross Carrying Amount	$ 66,364	$ 63,505	$ 69,693
Accumulated Amortization	(21,086)	(20,021)	(19,095)
Net Carrying Amount	45,278	43,484	50,598
Amortization expense of intangible assets	1,991	1,900
Estimated future amortization of intangible assets
Remaining nine months of 2013	6,149
2014	8,047
2015	7,144
2016	6,860
2017	4,954
2018	2,879
Thereafter	9,245
Total	45,278
North America
Changes in gross carrying amount of finite-lived intangible assets
Gross Carrying Amount	39,935	34,552	37,992
Accumulated Amortization	(13,313)	(14,304)	(12,012)
Net Carrying Amount	26,622	20,248	25,980
Europe
Changes in gross carrying amount of finite-lived intangible assets
Gross Carrying Amount	26,429	28,953	31,701
Accumulated Amortization	(7,773)	(5,717)	(7,083)
Net Carrying Amount	$ 18,656	$ 23,236	$ 24,618

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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