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Notes Payable and Other Noncurrent Liabilities - Current and Noncurrent Portions of Notes Payable (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jan. 22, 2019
Jun. 30, 2020
Dec. 31, 2019
Notes Payable and Other Noncurrent Liabilities      
Less: Current portion   $ 33,144 $ 33,144
Notes payable, less current portion   91,202 107,774
Amended and restated credit agreement      
Notes Payable and Other Noncurrent Liabilities      
Notes payable including current portion   124,346 140,918
Less: Current portion   33,144 33,144
Notes payable, less current portion   91,202 107,774
Amended and restated credit agreement | 30-Day LIBOR      
Notes Payable and Other Noncurrent Liabilities      
Margin on variable interest rate 2.00%    
Amended and restated credit agreement | Term loan facility      
Notes Payable and Other Noncurrent Liabilities      
Quarterly payment of notes payable   8,368  
Notes payable including current portion   $ 124,346 $ 140,918
Amended and restated credit agreement | Term loan facility | 30-Day LIBOR      
Notes Payable and Other Noncurrent Liabilities      
Margin on variable interest rate   2.17% 2.00%
Amended and restated credit agreement | Revolving credit facility | 30-Day LIBOR      
Notes Payable and Other Noncurrent Liabilities      
Margin on variable interest rate   2.17% 2.00%