Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ (46,476)	$ (56,879)
Effective tax rate	24.00%	26.00%
Federal statutory rate	21.00%	21.00%
State income tax expense	$ 3,200	$ 3,800
Increase in valuation allowances		16,400
One-time rate change on deferred tax assets and liabilities		8,300
Tax benefit from foreign subsidiary earnings		$ 4,900
Foreign tax credit carry forwards	25,300
Valuation allowance	25,300
Second component of tax deductible goodwill, net of tax	$ 300