Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 26, 2016
May 06, 2014
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
May 31, 2015
Class of Stock [Line Items]              
Authorized amount of common stock repurchase   $ 50,000,000         $ 50,000,000.0
Common Stock              
Class of Stock [Line Items]              
Authorized amount of common stock repurchase $ 50,000,000            
Repurchase period (in years) 1 year 1 year          
Number of shares repurchased (in shares)     235,154 369,861 1,012,823 771,304  
Weighted-average cost per share (in dollars per share)     $ 21.71 $ 19.46 $ 20.98 $ 19.64  
Total cost of shares repurchased     $ 5,106,000 $ 7,199,000 $ 21,244,000 $ 15,146,000