Fair Value Measurements and Derivative Instruments (Non-Derivative Balance Sheet) (Details) - Foreign currency debt - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivative instruments disclosure
Carrying Value	$ 263,031	$ 358,078
Current portion of long-term debt
Derivative instruments disclosure
Carrying Value	43,696	73,572
Long-term debt
Derivative instruments disclosure
Carrying Value	$ 219,335	$ 284,506