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Income Taxes (Income Tax Reconciliation) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense at statutory rates	$ 17,710,000	$ 19,851,000	$ 28,828,000
Increase (reduction) from:
Jurisdictional rate differences	988,000	719,000	(1,863,000)
Valuation allowance	460,000	(267,000)	308,000
Stock based compensation	(358,000)	(205,000)	(778,000)
U.S. state taxes	3,125,000	3,917,000	2,463,000
Domestic production deduction	0	0	(1,039,000)
R&D credit	(699,000)	(531,000)	(500,000)
GILTI	872,000	673,000	0
FIN 48 at acquisition	(1,504,000)	0	0
Other, net	835,000	219,000	397,000
Provision for income taxes before tax reform	$ 21,429,000	$ 24,376,000	27,816,000
Effective tax rate before effects of tax reform	25.00%	26.00%		34.00%
Tax Reform:
Rate change of deferreds	$ 0	$ 1,200,000	(3,334,000)
Transition tax on deemed repatriation	0	(4,531,000)	13,104,000
Other	0	0	466,000
Impact of tax reform	0	(3,331,000)	10,236,000
Provision for income tax	$ 21,429,000	$ 21,045,000	$ 38,052,000
Effective tax rate	25.00%	22.00%	46.00%

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