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Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Accumulated amortization for goodwill | $ 8,065 | $ 8,065
Goodwill [Roll Forward] |  |
Balance, beginning of year | 166,386 | 69,652
Acquisitions (Note 4) | 84,541 | 95,131
Foreign currency adjustments | (73) | 1,603
Other adjustments | 387 |
Balance, end of year | $ 251,241 | $ 166,386

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