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Goodwill and Intangible Assets, Net (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Summary of intangible assets acquired in business combinations |  |
Intangible assets with definite lives | $ 21,382 | $ 89,323
Less: accumulated amortization | (13,492) | (75,593)
Intangible assets with definite lives, net | 7,890 | 13,730
Intangible assets with indefinite lives | 30,300 | 30,300
Intangible assets, net | $ 38,190 | $ 44,030

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