Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
TCJA, provision reduction to income tax expense			$ 38,400
Income taxes paid	$ 74,900	$ 86,900	126,000
Unrecognized tax benefits accrued interest	$ 574	$ 315	$ 433