Pension And Severance Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Service cost	$ 1,787	$ 1,689	$ 5,360	$ 5,068
Interest on projected benefit obligation	1,247	1,343	3,746	4,038
Expected return on plan assets	(378)	(400)	(1,133)	(1,201)
Recognized actuarial loss	242	198	709	597
Amortization of prior service cost	32	32	96	96
Defined benefit and severance plan expense	$ 2,930	$ 2,862	$ 8,778	$ 8,598