Income Taxes (Income Tax Expense Difference) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax expense at Federal statutory income tax rate	$ 14,392	$ 11,576	$ 23,224
Impact of foreign operations	1,193	107	826
Foreign source income, net of tax credits	1,050	(2,248)	(197)
State tax, net of federal	(313)	(690)	121
Unrecognized tax benefits	5,800	543	(869)
U.S. Tax Reform	0	0	209
Equity compensation excess tax deductions	(791)	(2,902)	(2,238)
General business credits	(931)	(656)	(2,172)
Distribution related foreign taxes	2,332	1,240	1,916
Executive compensation limitation	900	589	801
Valuation allowance change (excluding U.S. Tax Reform)	(5,375)	(2,527)	602
Disproportionate tax effect of pension settlement charges	0	2,510	0
Other	287	265	715
Total	$ 18,544	$ 7,807	$ 22,938

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