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Employee and Non-Employee Director Stock and Benefit Plans - Stock Options/2007 Plan (Details)
1 Months Ended 7 Months Ended 12 Months Ended
Aug. 31, 2016
USD ($)
Jul. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2018
installment
item
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Employee and non-employee director stock and benefit plans          
Number of new hire award or portion thereof shall vest prior to the one-year anniversary of the date of grant as expected | item     0    
Number of Shares          
Exercised (in shares)     (65,611) (1,311,239) (24,498)
Stock options          
Number of Shares          
Outstanding at the beginning of the period (in shares)   42,665 196,851 196,851 42,665
Granted (in shares)     0   196,851
Exercised (in shares)     (65,611) 0 (42,665)
Outstanding at the end of the period (in shares)     131,240 196,851 196,851
Amount exercisable at the end of the period (in shares)     131,240 65,630  
Weighted Average Exercise Price          
Outstanding at the beginning of the period (in dollars per share) | $ / shares   $ 12.17 $ 16.18 $ 16.18 $ 12.17
Granted (in dollars per share) | $ / shares         16.18
Exercised (in dollars per share) | $ / shares     16.18   12.17
Outstanding at the end of the period (in dollars per share) | $ / shares     16.18 16.18 $ 16.18
Amount exercisable at the end of the period (in dollars per share) | $ / shares     $ 16.18 $ 16.18  
2007 Plan          
Employee and non-employee director stock and benefit plans          
Shares of common stock authorized     2,068,246    
Directors' Equity Subplan | Restricted stock unit awards          
Employee and non-employee director stock and benefit plans          
Value of shares granted at or shortly after the time of appointment | $ $ 120,000 $ 100,000      
Value of shares granted on the forty fifth day following each of the annual meetings of stockholders | $ $ 80,000        
Chief Executive Officer | Time-based award          
Employee and non-employee director stock and benefit plans          
Expiration period (in years)     8 years    
Number of equal annual vesting installments | installment     3    
Number of Shares          
Granted (in shares)         196,851