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Revolving Credit Facilities and Mortgage Payable - Primary Credit Facility (Details) - Primary Credit Facility - Line of Credit - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2020
Mar. 31, 2020
Notes Payable and Long-Term Debt      
Maximum borrowing capacity $ 600,000,000    
Additional borrowing capacity $ 200,000,000    
LIBOR based interest rates      
Notes Payable and Long-Term Debt      
Interest rate, effective percentage   2.12% 2.12%
Alternate Base Rate based interest rates      
Notes Payable and Long-Term Debt      
Interest rate, effective percentage   3.38% 3.38%
Revolving Credit Facility      
Notes Payable and Long-Term Debt      
Debt instrument term 5 years    
Maximum borrowing capacity $ 400,000,000    
Repayments of lines of credit     $ 50,000,000
Proceeds from lines of credit     50,000,000
Long-term line of credit   $ 0 0
Outstanding letters of credit   549,000 549,000
Amount available under the credit agreement   $ 399,451,000 $ 399,451,000
Minimum | Revolving Credit Facility      
Notes Payable and Long-Term Debt      
Fee on unused amount of revolving credit facility (as a percentage)   0.125%  
Minimum | Revolving Credit Facility | LIBOR based interest rates      
Notes Payable and Long-Term Debt      
Spread on variable interest rate (as a percent) 1.125%    
Minimum | Revolving Credit Facility | Alternate Base Rate based interest rates      
Notes Payable and Long-Term Debt      
Spread on variable interest rate (as a percent) 0.125%    
Maximum      
Notes Payable and Long-Term Debt      
Capacity available for letters of credit $ 25,000,000    
Sublimit available for borrowings in foreign currency $ 175,000,000    
Maximum | Revolving Credit Facility      
Notes Payable and Long-Term Debt      
Fee on unused amount of revolving credit facility (as a percentage)   0.20%  
Maximum | Revolving Credit Facility | LIBOR based interest rates      
Notes Payable and Long-Term Debt      
Spread on variable interest rate (as a percent) 1.625%    
Maximum | Revolving Credit Facility | Alternate Base Rate based interest rates      
Notes Payable and Long-Term Debt      
Spread on variable interest rate (as a percent) 0.625%    
Prepaid Expenses and Other Current Assets | Revolving Credit Facility      
Notes Payable and Long-Term Debt      
Deferred financing costs $ 1,297,000