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Stockholders' Equity - Narrative Restricted Stock Awards and Stock Option Grants (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]      
Weighted average exercise price (in dollars per share) $ 20.13 $ 17.77  
Restricted Stock      
Class of Stock [Line Items]      
Options vested in period, fair value $ 3.6 $ 4.5 $ 3.1
Grants in period, weighted average grant date fair value (USD per share) $ 17.32 $ 18.24 $ 18.49
Unrecognized compensation costs related to restricted stock awards $ 6.2 $ 7.1 $ 7.5
Period of stock option compensation cost recognition 2 years 6 months 2 years 10 months 28 days 3 years 9 months
Employee Stock Option      
Class of Stock [Line Items]      
Unrecognized compensation costs related to restricted stock awards $ 4.5 $ 2.8  
Period of stock option compensation cost recognition 2 years 10 months 2 days 1 year 11 months 5 days  
Weighted average exercise price (in dollars per share) $ 3.79 $ 8.36 $ 5.91