Defined Benefit Pension Plans Schedule of Net Periodic Pension Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule of Net Periodic Pension Benefit Costs [Line Items]
Service cost	$ 948	$ 981
Interest cost	893	800
Expected return on plan assets	(157)	(79)
Settlements and other	(2)	(814)
Amortization of actuarial net loss	123	251
Amortization of unrecognized prior service costs	18	17
Net periodic benefit cost	$ 1,823	$ 1,156