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Stockholders' Equity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Shares repurchase and retirement [Line Items]          
Allocated Share-based Compensation Expense $ 6,100 $ 4,600   $ 15,200 $ 11,900
Stock Repurchased and Retired During Period, Shares       43,000  
Stock Repurchased and Retired During Period, Value       $ 1,600  
Stock Issued During Period, Shares, Acquisitions     794,700 794,700  
Stock Issued During Period, Value, Acquisitions     $ 30,200 $ 30,200  
Additional Paid-in Capital [Member]          
Shares repurchase and retirement [Line Items]          
Stock Repurchased and Retired During Period, Value       400  
Retained Earnings [Member]          
Shares repurchase and retirement [Line Items]          
Stock Repurchased and Retired During Period, Value       $ 1,200