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Stockholders' Equity - Summary of Certain Information With Respect to the Performance Share Awards (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Expense $ 500   $ 500  
Performance Shares        
Fair Value     13,359  
Accrual     10,189  
Expense 1,211 $ 1,301 4,981 $ 4,326
Performance Shares | January 1, 2018 - December 31, 2020        
Fair Value     6,130  
Accrual     3,568  
Expense 547 268 2,433 791
Performance Shares | January 1, 2017 - December 31, 2019        
Fair Value     7,229  
Accrual     6,621  
Expense 664 546 2,548 1,655
Performance Shares | January 1, 2016 - December 31, 2018        
Fair Value     0  
Accrual     0  
Expense 0 487 0 1,880
Performance Shares | January 1, 2019 - December 31, 2021        
Fair Value     4,829  
Expense $ 402 $ 0 $ 1,207 $ 0