Pension and Severance Plans (Impact on Accumulated Other Comprehensive Income) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	$ (5,373,000)	$ (10,510,000)
Amortization included in net periodic pension cost, net of tax	364,000	406,000
Net gain arising during period, net of tax	3,996,000	4,731,000
Unrecognized pension costs, end of year	(1,013,000)	(5,373,000)	(10,510,000)
Estimated amortization of cost to be included in 2012 net periodic pension cost	282,000
Prior service cost recognized in net periodic pension cost, Tax	100,000	100,000
Net gain (loss) recognized in net periodic benefit cost, Tax	200,000	100,000
Adjustments to unrealized components of defined benefit pension plans, tax effect	252,000	35,000	(362,000)
Unrealized components of defined benefit pension plan, tax	1,000,000	1,300,000	1,400,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	4,360,000	5,137,000	(5,800,000)
Initial Net Obligation [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	(52,000)	(58,000)
Amortization included in net periodic pension cost, net of tax	8,000	6,000
Net gain arising during period, net of tax	0	0
Unrecognized pension costs, end of year	(44,000)	(52,000)
Estimated amortization of cost to be included in 2012 net periodic pension cost	5,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	8,000	6,000
Prior Service Cost [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	188,000	(31,000)
Amortization included in net periodic pension cost, net of tax	250,000	219,000
Net gain arising during period, net of tax	0	0
Unrecognized pension costs, end of year	438,000	188,000
Estimated amortization of cost to be included in 2012 net periodic pension cost	211,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	250,000	219,000
Actuarial Net Gain Loss [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	(5,509,000)	(10,421,000)
Amortization included in net periodic pension cost, net of tax	106,000	181,000
Net gain arising during period, net of tax	3,996,000	4,731,000
Unrecognized pension costs, end of year	(1,407,000)	(5,509,000)
Estimated amortization of cost to be included in 2012 net periodic pension cost	66,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ 4,102,000	$ 4,912,000