Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
9 Months Ended
Apr. 28, 2017
Sep. 30, 2017
Sep. 30, 2016
May 31, 2014
Class of Stock [Line Items]        
Authorized amount of common stock repurchase       $ 50,000,000
Common Stock        
Class of Stock [Line Items]        
Authorized amount of common stock repurchase $ 50,000,000      
Repurchase period (in years) 1 year      
Number of shares repurchased (in shares)   0 1,012,823  
Weighted-average cost per share (in dollars per share)   $ 0.00 $ 20.98  
Total cost of shares repurchased   $ 0 $ 21,244,000