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Stockholders' Equity - Summary of Certain Information With Respect to the Performance Share Awards (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Expense $ 500   $ 500  
Performance Shares        
Fair Value     13,226  
Accrual     8,979  
Expense 2,392 $ 1,367 3,770 $ 3,025
Performance Shares | January 1, 2018 - December 31, 2020        
Fair Value     6,065  
Accrual     3,021  
Expense 1,295 279 1,886 523
Performance Shares | January 1, 2017 - December 31, 2019        
Fair Value     7,161  
Accrual     5,958  
Expense 1,097 509 1,884 1,109
Performance Shares | January 1, 2016 - December 31, 2018        
Expense   579   1,393
Performance Shares | January 1, 2019 - December 31, 2021        
Fair Value     4,829  
Expense $ 403 $ 0 $ 805 $ 0