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Share-Based Compensation - Summary of Information about Restricted Stock Grants Outstanding (Details) - USD ($)
shares in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Unearned compensation $ 1,800,000  
Restricted Stock    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 75 64
Restricted Stock | October 2016    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 411  
Unearned compensation $ 205,100  
Remaining Periods (in months) 4 years  
Restricted Stock | October 2016 | Year 1    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2016 | Year 2    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2016 | Year 3    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | July 2017    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 6  
Unearned compensation $ 5,300  
Remaining Periods (in months) 4 years  
Restricted Stock | July 2017 | Year 1    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | July 2017 | Year 2    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | July 2017 | Year 3    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2017    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 303  
Unearned compensation $ 1,177,500  
Remaining Periods (in months) 16 years  
Restricted Stock | October 2017 | Year 1    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2017 | Year 2    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2017 | Year 3    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2018    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 382  
Unearned compensation $ 1,948,800  
Remaining Periods (in months) 28 years  
Restricted Stock | October 2018 | Year 1    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2018 | Year 2    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2018 | Year 3    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | May 2019    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 71  
Unearned compensation $ 450,000  
Remaining Periods (in months) 10 years