Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Capital loss carry-forwards	$ 3,374,000	$ 23,746,000
Foreign provision for income taxes	117,212,000	108,714,000	$ 102,824,000
Undistributed earnings	635,828,000
Unrecognized deferred tax liability related to temporary differences	11,246,000
Earnings retained by subsidiaries and equity accounted investments	645,828,000	500,430,000	484,510,000
Gross unrecognized tax benefits	20,298,000	20,232,000	$ 22,584,000
Unrecognized tax benefits that would impact effective tax rate	9,248,000	8,854,000
Accrued interest and penalties	4,003,000	3,569,000
Capital Loss Carryforward [Member]
Income Tax Disclosure [Line Items]
Capital loss carry-forwards	$ 43,476,000	$ 39,981,209