Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Refundable income taxes	$ 9,500	$ 16,900
Income taxes payable	16,000	8,400
State and local operating loss carryforwards	28,100
Foreign operating loss carryforwards	$ 167,100
Minimum duration of operating loss carryforwards that expire	1 year
Maximum duration of operating loss carryforwards that expire	20 years
Tax credit carryforwards	$ 22,589
Deferred tax asset valuation allowance	10,872	10,447
Unrecognized tax benefits that would impact effective tax rate	8,500	8,700	$ 9,200
Expense (benefit) for interest, net of tax, and penalties related to unrecognized tax benefits	600	500	400
Accrued amount for payment of interest, net of tax, and penalties related to unrecognized tax benefits	2,900	2,900	$ 1,800
Anticipated reversal within next 12 months of liabilities for unrecognized tax benefits	7,000
Deferred income taxes provided on undistributed earnings of foreign subsidiaries	1,903	$ 1,594
Undistributed earnings of foreign subsidiaries not indefinitely reinvested	13,800
Undistributed earning of foreign subsidiaries indefinitely reinvested	$ 232,900