Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Deferred	$ (2,366,000)	$ 7,628,000	$ 7,422,000
Effect of Tax Cuts and Jobs Act [Abstract]
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings Liability	57,500,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings Liability NonCurrent	51,000,000.0
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)		6,400,000	101,600,000
Revaluation of deferred tax assets and liabilities		2,000,000.0	(3,900,000)
Provisional impact of U.S. Tax Reform	$ 0	4,353,000	(97,707,000)
Tax Cuts and Jobs Act, Accounting Complete [true false]	true
Tax Cuts and Jobs Act, Accounting Complete, Date	Dec. 31, 2018
Global Intangible Low-Taxed Income	$ 955,000	3,206,000	0
Foreign earnings repatriated	52,100,000	560,600,000
Income tax expense on foreign earnings expected to be repatriated	0	21,612,000	0
Net change in total deferred tax asset valuation allowance	2,300,000	2,100,000	200,000
Cumulative undistributed earnings of foreign subsidiaries	313,900,000
Income tax incentives	$ 5,035,000	$ 7,886,000	$ 7,238,000
Net impact of tax incentives, per diluted share	$ 0.13	$ 0.17	$ 0.15
Interest on unrecognized tax	$ 100,000
Penalty on unrecognized tax	17,000.0
Accrued income tax penalties and interest on unrecognized tax benefits	600,000
Interest and penalties included in income tax expense	0	$ 100,000	$ 0
Additional reserve for uncertain tax benefits	200,000	0	894,000
Decreases related to prior year tax positions	0	532,000	8,197,000
Unrecognized deferred tax liability	1,700,000
U.S. Federal [Member]
Effect of Tax Cuts and Jobs Act [Abstract]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)		3,200,000
Revaluation of deferred tax assets and liabilities		9,200,000
Provisional impact of U.S. Tax Reform		(4,400,000)
Operating loss carryforwards	$ 16,500,000
U.S. Federal [Member] | Earliest Tax Year [Member]
Effect of Tax Cuts and Jobs Act [Abstract]
Tax credit carryforward expiration year	2027
U.S. Federal [Member] | Latest Tax Year [Member]
Effect of Tax Cuts and Jobs Act [Abstract]
Operating loss carryforwards expiration Year	2036
State and local [Member]
Effect of Tax Cuts and Jobs Act [Abstract]
Operating loss carryforwards	$ 44,500,000
Tax credit carryforward	$ 1,900,000
State and local [Member] | Earliest Tax Year [Member]
Effect of Tax Cuts and Jobs Act [Abstract]
Operating loss carryforwards expiration Year	2020
State and local [Member] | Latest Tax Year [Member]
Effect of Tax Cuts and Jobs Act [Abstract]
Operating loss carryforwards expiration Year	2031
Tax credit carryforward expiration year	2026
Foreign [Member]
Effect of Tax Cuts and Jobs Act [Abstract]
Income tax expense on foreign earnings expected to be repatriated		30,800,000
Operating loss carryforwards	$ 27,500,000
Foreign operating loss with indefinited carry forward period	$ 24,800,000
Foreign [Member] | Latest Tax Year [Member]
Effect of Tax Cuts and Jobs Act [Abstract]
Operating loss carryforwards expiration Year	2029
China [Member]
Effect of Tax Cuts and Jobs Act [Abstract]
Income tax incentives	$ 0	1,884,000	1,398,000
Malaysia [Member}
Effect of Tax Cuts and Jobs Act [Abstract]
Income tax incentives	3,010,000	3,287,000	4,295,000
Thailand [Member]
Effect of Tax Cuts and Jobs Act [Abstract]
Income tax incentives	$ 2,025,000	2,715,000	$ 1,545,000
Decreases related to prior year tax positions		$ 7,300,000