Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
May. 06, 2015
Class of Stock [Line Items]      
Number of shares repurchased 1,798,199 966,595  
Weighted average cost per share (in dollars per share) $ 19.51 $ 16.06  
Cost to repurchase stock $ 35,083,000 $ 15,521,000  
Common Stock      
Class of Stock [Line Items]      
Amount authorized to be repurchased     $ 50,000,000
Number of shares retired 2,764,794