Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income taxes paid	$ 61,900	$ 74,900	$ 86,900
Unrecognized tax benefits accrued interest	$ 577	$ 574	$ 315