Pension and Severance Plans (Defined Benefit Plans - Expected future contributions and other disclosures) (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Employer contributions		$ 1,120,000	$ 8,687,000	$ 3,600,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	2,500,000
2013	2,663,000	2,663,000
2014	3,410,000	3,410,000
2015	2,901,000	2,901,000
2016	3,198,000	3,198,000
2017	4,047,000	4,047,000
2018 to 2022	$ 33,275,000	$ 33,275,000