Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Debt, gross	$ 489,026	$ 468,250
Other debt	3,926	0
Less: Unamortized discount and debt issuance costs	913	1,150
Less: Debt, current portion	9,194	7,500
Debt, net of current portion	$ 478,919	$ 459,600
Weighted average effective interest rate	2.78%	3.18%
Revolving credit loans [Member]
Line of Credit Facility [Line Items]
Debt, gross	$ 207,600	$ 187,000
Weighted average effective interest rate	2.41%	3.11%
Term loans [Member]
Line of Credit Facility [Line Items]
Debt, gross	$ 277,500	$ 281,250
Weighted average effective interest rate	3.02%	3.22%
Loans payable [Member]
Line of Credit Facility [Line Items]
Weighted average effective interest rate	5.00%	0.00%
Short-term debt [Member]
Line of Credit Facility [Line Items]
Weighted average effective interest rate	2.29%	3.05%
Long-term debt [Member]
Line of Credit Facility [Line Items]
Weighted average effective interest rate	2.78%	3.18%