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Stock Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Board of Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Nonemployee services transaction, quarterly fee   $ 33      
The 2009 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Capital shares reserved for future issuance (in shares)   1,131,000      
Compensation cost not yet recognized   $ 6,150      
Period for recognition for compensation cost not yet recognized   2 years 10 months 24 days      
The 2009 Stock Incentive Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)   6,000 0 472,000  
Unvested RSU awards outstanding (in dollars per share)   $ 24.82 $ 24.82 $ 24.82 $ 39.80
Subsequent Event | The 2009 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Capital shares reserved for future issuance (in shares) 677,000        
Subsequent Event | Armour Capital Management | The 2009 Stock Incentive Plan | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 310,000        
Subsequent Event | Board of Directors | The 2009 Stock Incentive Plan | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 144,000