Pension and Severance Plans (Defined Benefit Plans - Allocation of plan assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 76,042	$ 54,771	$ 50,304
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30,190	22,825
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,666	12,996
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,944	5,742
Fair Value, Inputs, Level 1 [Member] | Foreign Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,689	3,035
Fair Value, Inputs, Level 1 [Member] | US Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,498	19,790
Fair Value, Inputs, Level 1 [Member] | US Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,492	4,321
Fair Value, Inputs, Level 1 [Member] | US Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,187	0
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	880	0
Fair Value, Inputs, Level 1 [Member] | Foreign Treasury Notes [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,665	10,156
Fair Value, Inputs, Level 1 [Member] | Taiwan Retirement Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,621	8,632
Fair Value, Inputs, Level 2 [Member] | US Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	2,840
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,092	0
Fair Value, Inputs, Level 2 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	129	255
Fair Value, Inputs, Level 3 [Member] | US Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	0
Fair Value, Inputs, Level 3 [Member] | Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 842	0
JAPAN | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	43.00%
JAPAN | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	55.00%
JAPAN | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	2.00%
KOREA, REPUBLIC OF | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	50.00%
KOREA, REPUBLIC OF | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	40.00%
KOREA, REPUBLIC OF | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	10.00%
PHILIPPINES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amount of Employer and Related Party Securities Included in Plan Assets	$ 600	$ 700
PHILIPPINES | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	57.00%
PHILIPPINES | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	38.00%
PHILIPPINES | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	5.00%