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Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Aug. 31, 2012
Dec. 31, 2010
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired     100.00%  
Business Acquisition, Cost of Acquired Entity, Purchase Price     $ 39,000  
Accrued holdback for acquisition 0 12,000   0
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets     16,000  
Business Acquisition, Purchase Price Allocation, Goodwill Amount     26,000  
Historical annual revenue of acquired company $ 14,000