Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate	18.10%	17.60%	30.90%
Income taxes paid	$ 88,000	$ 69,700	$ 81,200
Income tax ruling exemption	13,700	9,200	8,900
Valuation allowance	9,454	6,212
Net operating loss carryforwards in certain state and international jurisdictions	17,000
Unrecognized tax benefits	26,841	24,247	21,417	$ 18,463
Unrecognized tax benefits that would impact effective tax rate if recognized	21,200	18,300
Interest expense and penalties related to unrecognized tax benefits	1,800	1,200	$ 900
Interest expense and penalties accrued	$ 3,600	$ 2,100