Pension and Severance Plans (Defined Benefit Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	$ 81,572,000	$ 80,528,000
Service cost	5,042,000	5,909,000
Interest cost	3,051,000	3,170,000
Benefits paid	(2,620,000)	(1,602,000)
Actuarial losses (gains)	3,514,000	(2,513,000)
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	0	13,017,000
Defined Benefit Plan, Divestitures, Benefit Obligation	(14,814,000)	0
Effects of curtailment	0	(176,000)
Settlement	0	(8,701,000)
Foreign exchange gain	(1,736,000)	(8,060,000)
Projected benefit obligation at end of year	74,009,000	81,572,000	80,528,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	50,304,000	58,146,000
Actual gain on plan assets	4,149,000	5,159,000
Employer contributions	3,756,000	1,120,000
Settlement	0	(8,701,000)
Foreign exchange loss	(818,000)	(3,818,000)
Fair value of plan assets at end of year	54,771,000	50,304,000	58,146,000
Funded status of the Plans at end of year	(19,238,000)	(31,268,000)
Defined Benefit Plan, Assets for Plan Benefits [Abstract]
Accrued benefit liability (included in pension and severance obligations)	(19,200,000)	(31,300,000)
Accumulated benefit obligation	44,100,000	55,900,000
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Aggregate projected benefit obligation	74,044,000	73,326,000
Aggregate fair value of plan assets	54,771,000	41,957,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Aggregate accumulated benefit obligation	11,854,000	24,877,000
Aggregate fair value of plan assets	0	0
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate for determining net periodic pension cost	3.90%	3.90%	4.20%
Discount rate for determining benefit obligations at year end	4.20%	3.90%	4.00%
Rate of compensation increase for determining net periodic pension cost	4.10%	4.10%	4.50%
Rate of compensation increase for determining benefit obligations at year end	4.70%	4.10%	4.10%
Expected rate of return on plan assets for determining net periodic pension cost	6.20%	6.30%	6.30%
Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at end of year	22,825,000	20,173,000
Foreign Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Return on Plan Assets	3,094,000	3,508,000	3,188,000
Defined Benefit Plan, Net Periodic Benefit Cost	5,256,000	5,944,000	6,960,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	176,000	(1,089,000)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	(97,000)	120,000	100,000
Pension Expense	5,353,000	5,648,000	7,949,000
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	116,000	231,000	291,000
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost	5,042,000	5,909,000	6,362,000
Interest cost	3,051,000	3,170,000	3,270,000
Actuarial losses (gains)	(141,000)	(142,000)	(225,000)
Philippine Subsidiaries [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount of employer and related party securities included in plan assets	$ 700,000	$ 600,000
Philippine Subsidiaries [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	55.00%
Philippine Subsidiaries [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	45.00%