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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
RSUs        
Number of shares outstanding        
Balance at the beginning of the period ( in shares)     1,456,000  
Granted (in shares)     439,000  
Vested/Released (in shares)     (345,000)  
Forfeited (in shares)     (68,000)  
Balance at the end of the period ( in shares) 1,482,000   1,482,000  
Weighted Average Grant Date Fair Value        
Balance at the beginning of the period (in dollars per share)     $ 19.83  
Grant date fair value (in dollars per share)     27.08  
Vested/Released (in dollars per share)     23.36  
Forfeited (in dollars per share)     23.09  
Balance at the end of the period (in dollars per share) $ 21.00   $ 21.00  
Restricted Stock Awards        
Number of shares outstanding        
Balance at the beginning of the period ( in shares)     4,000  
Vested/Released (in shares)     (4,000)  
Weighted Average Grant Date Fair Value        
Balance at the beginning of the period (in dollars per share)     $ 19.95  
Vested/Released (in dollars per share)     $ 19.95  
RSUs and RSAs        
Stock based compensation        
Vested/Released number of shares withheld to satisfy employee statutory tax obligations (in shares)     88,681  
2012 Plan        
Stock based compensation        
Number of awards approved for grant (in shares) 4,000,000   4,000,000  
Common stock remaining available for issuance (in shares) 1,582,281   1,582,281  
Compensation expense $ 2.8 $ 2.6 $ 8.7 $ 7.6
2012 Plan | RSUs        
Stock based compensation        
Number of awards subject to time-based vesting (in shares)     1,177,641  
Number of awards vesting upon achievement of performance goals (in shares)     303,800  
Vesting period     3 years  
Performance period     3 years  
Unrecognized compensation expense $ 16.2   $ 16.2  
Weighted average period for unrecognized compensation expense (in years)     1 year 5 months 1 day  
2012 Plan | Board of Directors        
Stock based compensation        
Common shares granted to members of board of directors as compensation for director services     11,959 16,506
2012 Plan | Certain Executives and Key Employees | RSUs        
Stock based compensation        
Number of awards subject to time-based vesting (in shares)     322,493  
Number of awards vesting upon achievement of performance goals (in shares)     89,439  
Vesting period     3 years  
Performance period     3 years  
Number of shares outstanding        
Granted (in shares)     421,189