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Revolving Credit Facilities and Mortgage Payable - Domestic Line of Credit (Details) - USD ($)
1 Months Ended 3 Months Ended
Aug. 03, 2018
Nov. 30, 2014
Jun. 30, 2018
Credit Agreement      
Notes Payable and Long-Term Debt      
Term of agreement (in years)   5 years  
Current borrowing capacity   $ 400,000,000  
Credit Agreement | LIBOR based interest rates      
Notes Payable and Long-Term Debt      
Interest rate, effective percentage     3.34%
Credit Agreement | Alternate Base Rate based interest rates      
Notes Payable and Long-Term Debt      
Interest rate, effective percentage     5.25%
Second Amended And Restated Credit Agreement, As Amended | Line of Credit | Revolving Credit Facility      
Notes Payable and Long-Term Debt      
Proceeds from lines of credit     $ 0
Repayments of lines of credit     0
Long-term line of credit     0
Amount available under the credit agreement     399,451,000
Outstanding letters of credit     $ 549,000
Second Amended And Restated Credit Agreement, As Amended | Line of Credit | Revolving Credit Facility | Subsequent Event      
Notes Payable and Long-Term Debt      
Proceeds from lines of credit $ 0    
Long-term line of credit 0    
Amount available under the credit agreement $ 399,451,000    
Maximum | Second Amended And Restated Credit Agreement, As Amended      
Notes Payable and Long-Term Debt      
Capacity available for letters of credit   75,000,000  
Capacity available for swing loans   $ 5,000,000