Quarterly report pursuant to Section 13 or 15(d)

Acquisition (Details)

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Acquisition (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Apr. 30, 2013
Acquisition [Abstract]      
Business Acquisition, Percentage of Voting Interests Acquired     100.00%
Business Acquisition, Cost of Acquired Entity, Purchase Price     $ 142,495
Common stock issued for acquisition 75,425 0  
Business Acquisition, Cost of Acquired Entity, Cash Paid     67,070
Common stock issued for stock offering (in shares) 342,640    
Common stock issued for stock offering 15,225    
Business Acquisition, Purchase Price Allocation, Goodwill Amount     91,260
Business Acquisition, Purchase Price Allocation, Intangible Assets     $ 35,000