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Debt (Summary of Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]    
Debt, gross $ 547,306 $ 534,177
Other debt 2,232 3,926
Less: Unamortized discount and debt issuance costs 2,422 3,144
Less: Debt, current portion 12,911 12,840
Debt, net of current portion $ 531,973 $ 518,193
Weighted average effective interest rate 2.75% 3.21%
Revolving credit loans [Member]    
Line of Credit Facility [Line Items]    
Debt, gross $ 90,000 $ 69,625
Weighted average effective interest rate 1.73% 1.83%
Term loans [Member]    
Line of Credit Facility [Line Items]    
Debt, gross $ 395,000 $ 400,000
Weighted average effective interest rate 2.60% 3.12%
Mortgages [Member]    
Line of Credit Facility [Line Items]    
Debt, gross $ 60,074 $ 60,626
Weighted average effective interest rate 5.22% 5.22%
Loans payable [Member]    
Line of Credit Facility [Line Items]    
Weighted average effective interest rate 5.00% 5.00%
Short-term debt [Member]    
Line of Credit Facility [Line Items]    
Weighted average effective interest rate 2.61% 2.61%
Long-term debt [Member]    
Line of Credit Facility [Line Items]    
Weighted average effective interest rate 2.76% 3.22%