Defined Benefit Pension Plans Schedule of Net Periodic Pension Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Net Periodic Pension Benefit Costs [Line Items]
Service cost	$ 981	$ 738
Interest cost	800	926
Expected return on plan assets	(79)	(85)
Settlements and other	(814)	0
Actuarial losses	251	2
Amortization of unrecognized prior service costs	17	17
Net periodic benefit cost	$ 1,156	$ 1,598