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Stock-Based Awards - RSUs (Details) - $ / shares
1 Months Ended 12 Months Ended
Jul. 31, 2012
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
RSU, Weighted Average Grant Date Fair Value Per Unit        
Granted, estimated grant-date fair value (in dollars per share) $ 0.00001      
Restricted Stock Units (RSUs) [Member]        
RSU, Number of Units        
Units outstanding, beginning of period   53,800    
Granted   180,764 53,800 0
Number of shares, Vested   (12,950)    
Forfeited and cancelled   (2,000)    
Units outstanding, end of period   219,614 53,800  
RSU, Weighted Average Grant Date Fair Value Per Unit        
Weighted average grant date fair value, beginning balance (in dollars per share)   $ 28.68    
Granted, estimated grant-date fair value (in dollars per share)   27.16 $ 28.68  
Weighted average grant date fair value, vested (in dollars per share)   28.68    
Forfeited and cancelled, estimated grant date fair value (in dollars per share)   28.68    
Weighted average grant date fair value, ending balance (in dollars per share)   $ 27.43 $ 28.68