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Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Goodwill / Tradename    
Beginning balance $ 19,548 $ 14,661
Tradename, Beginning balance 3,526 3,218
Acquisitions 16,572 4,806
Acquisitions, Tradename 1,963 300
Foreign currency adjustments (415) 81
Foreign currency adjustments, Tradename (57) 8
Ending balance 35,705 19,548
Tradename, Ending balance $ 5,432 $ 3,526