Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
U.S. Deferred tax benefit	$ 9,262	$ 7,055	$ (12,781)
Net change in total deferred tax asset valuation allowance	200	1,200	19,500
Cumulative undistributed earnings of foreign subsidiaries	928,000
Income tax incentives	$ 7,238	$ 6,716	$ 13,693
Net impact of tax incentives, per diluted share	$ 0.15	$ 0.13	$ 0.26
Unrecognized tax benefits including interest and penalties	$ 800
Interest on unrecognized tax	100
Accrued income tax penalties and interest on unrecognized tax benefits	100	$ 100	$ 3,300
Interest and penalties included in income tax expense	0	0	100
Additional reserve for uncertain tax benefits	894	89	800
Decrease in unrecognized tax benefits reserve due to expiration of statute of limitations	0	5,079	1,653
Decreases related to prior year tax positions	8,197	333	789
U.S. Federal [Member]
Income Taxes [Line Items]
Mandatory deemed repatriation of undistributed foreign earnings	101,600
U.S. Accrued Income Taxes	87,700
U.S. Accrued Income Taxes Noncurrent	80,700
U.S. Deferred tax benefit	(3,900)
Net change in total deferred tax asset valuation allowance			19,600
Operating loss carryforwards	$ 32,400
U.S. Federal [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Operating loss carryforwards expiration Year	2025
U.S. Federal [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Operating loss carryforwards expiration Year	2036
State and local [Member]
Income Taxes [Line Items]
Operating loss carryforwards	$ 77,500
Tax credit carryforward	$ 2,000
State and local [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Operating loss carryforwards expiration Year	2018
State and local [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Operating loss carryforwards expiration Year	2031
Foreign [Member]
Income Taxes [Line Items]
Operating loss carryforwards	$ 25,700
Foreign operating loss with indefinited carry forward period	$ 24,600
Foreign [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Operating loss carryforwards expiration Year	2027
China [Member]
Income Taxes [Line Items]
Income tax incentives	$ 1,398	1,302	5,347
China [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Income tax holidays expiration date	2018
Malaysia [Member}
Income Taxes [Line Items]
Income tax incentives	$ 4,295	2,346	2,075
Malaysia [Member} | Latest Tax Year [Member]
Income Taxes [Line Items]
Income tax holidays expiration date	2021
Thailand [Member]
Income Taxes [Line Items]
Income tax incentives	$ 1,545	$ 3,068	$ 6,271
Decreases related to prior year tax positions	$ 7,300
Thailand [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Income tax holidays expiration date	2028