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Debt - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 12, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
May 23, 2016
Line of Credit Facility              
Line of credit maximum borrowing amount   $ 300,000   $ 300,000      
Debt amortization expense   42 $ 41 84 $ 77    
Long-term Line of Credit, Noncurrent   141,300   $ 141,300   $ 99,700  
Line of Credit | Revolving Credit Facility Due 2024              
Line of Credit Facility              
Debt instrument, term 5 years            
Line of credit maximum borrowing amount $ 300,000         $ 300,000 $ 300,000
Line of credit facility contingent increase to maximum borrowing capacity 150,000            
Commitment fee percentage per annum       0.25%   0.23%  
Long-term Line of Credit, Noncurrent   $ 141,300   $ 141,300      
Line of Credit | Revolving Credit Facility Due 2024 Swingline Sublimit              
Line of Credit Facility              
Line of credit maximum borrowing amount 15,000            
Line of Credit | Revolving Credit Facility Due 2024 Letter Of Credit Sublimit              
Line of Credit Facility              
Line of credit maximum borrowing amount $ 10,000            
Minimum | Line of Credit | Revolving Credit Facility Due 2024              
Line of Credit Facility              
Commitment fee percentage per annum 0.20%            
Maximum | Line of Credit | Revolving Credit Facility Due 2024              
Line of Credit Facility              
Commitment fee percentage per annum 0.30%