Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 8,727	$ 43,666	$ 53,807	$ 133,092
Effective tax rate	7.00%	27.00%	12.00%	26.00%
Federal statutory rate			21.00%
Tax benefit from foreign operations	$ 13,600		$ 15,600
Tax benefit from deferred tax adjustment	11,500		11,500
State and local income tax expense	4,300	$ 3,400	11,600	$ 9,500
Tax expense (benefit) from change in valuation allowance	2,000		(21,500)
Tax benefit relating to uncertain tax positions			5,600
Tax expense from foreign operations		$ 5,600
Federal income tax expense				15,800
One-time rate change on deferred tax assets and liabilities				8,300
Tax benefit from foreign subsidiary earnings				$ 600
Foreign tax credit carry forwards	20,200		20,200
Valuation allowance	20,200		20,200
Second component of tax deductible goodwill, net of tax	$ 1,000		$ 1,000