Defined Benefit Pension Plans Schedule of Net Periodic Pension Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,205	$ 2,700	$ 2,512
Interest cost	3,355	3,625	3,754
Expected Return on Plan Assets	(635)	(331)	(322)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	70	68	74
Amortization of actuarial net (gains) loss	926	161	(85)
Defined Benefit Plan, Settlement and Other Benefit Costs	(493)	97	25
Net Periodic Benefit Cost	$ 7,428	$ 6,320	$ 5,958