Defined Benefit Pension Plans Schedule of Net Periodic Pension Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Net Periodic Pension Benefit Costs [Line Items]
Service cost	$ 1,011	$ 676	$ 1,992	$ 1,414
Interest cost	786	909	1,586	1,835
Expected return on plan assets	(79)	(82)	(158)	(167)
Settlements and other	0	0	(814)	0
Amortization of actuarial net loss	246	2	497	4
Amortization of unrecognized prior service costs	17	17	34	34
Net periodic benefit cost	$ 1,981	$ 1,522	$ 3,137	$ 3,120