Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Goodwill impairment charge	$ 379,863
Goodwill, not tax deductible and yielded permanent differences between book and taxable income	209,500
Goodwill impairment, tax benefit	$ 49,400
Income taxes, statutory rate	21.00%	21.00%	35.00%
Impact of federal tax law change		$ (211)	$ 53,348
Unrecognized tax benefits that would impact effective tax rate	$ 5,700
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	29,300
Credit carryforwards	6,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	184,800
Credit carryforwards	$ 1,200