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Credit Agreement (Details) - USD ($)
Feb. 19, 2019
Jun. 30, 2020
Feb. 21, 2019
Line of Credit Facility [Line Items]      
Borrowings under Revolver credit agreement   $ 0  
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 165,000,000
Right to increase     50,000,000
Borrower and guarantor obligations under debt agreement, capital stock of first-tier foreign subsidiaries, percent 65.00%    
Revolving Credit Facility | Federal Funds Effective Swap Rate      
Line of Credit Facility [Line Items]      
Basis spread 0.50%    
Revolving Credit Facility | Eurodollar      
Line of Credit Facility [Line Items]      
Basis spread 1.00%    
Applicable margin 0.0175    
Revolving Credit Facility | Base Rate      
Line of Credit Facility [Line Items]      
Applicable margin 0.0075    
Revolving Credit Facility | Letter of Credit Sublimit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     100,000,000
Revolving Credit Facility | Swing Line Sublimit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 15,000,000