Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 52,195	$ 8,727	$ 95,490	$ 53,807
Effective tax rate	43.00%	7.00%	38.00%	12.00%
Federal statutory rate	21.00%	21.00%	21.00%	21.00%
Tax expense (benefit) from change in valuation allowance	$ 20,000	$ 2,000	$ 25,600	$ 21,500
Tax expense from foreign operations	400		9,800	5,600
State and local income tax expense	3,500	4,300	9,100	11,600
Tax expense relating to a disallowed deduction	1,700		4,700
Tax expense (benefit) relating to uncertain tax positions	2,700		(6,000)
Tax benefit from foreign operations		13,600		15,600
Tax benefit from deferred tax adjustment		$ 11,500		$ 11,500
Foreign tax credit carry forwards	33,200		33,200
Valuation allowance	31,800		31,800
Second component of tax deductible goodwill, net of tax	$ 1,000		$ 1,000