Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Goodwill impairment charge	$ 0	$ 379,863	$ 0
Goodwill, not tax deductible and yielded permanent differences between book and taxable income		209,500
Goodwill impairment, tax benefit		49,400
Unrecognized tax benefits that would impact effective tax rate	8,700
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0	29,300
Credit carryforwards	1,400	6,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	196,500	184,800
Credit carryforwards	$ 2,000	$ 1,200