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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Net Periodic Pension Benefit Costs [Line Items]
Service cost	$ 1,079	$ 1,011	$ 2,027	$ 1,992
Interest cost	897	786	1,790	1,586
Expected return on plan assets	(163)	(79)	(320)	(158)
Settlements and other	29	0	27	(814)
Amortization of actuarial net loss	122	246	245	497
Amortization of unrecognized prior service costs	18	17	36	34
Net periodic benefit cost	$ 1,982	$ 1,981	$ 3,805	$ 3,137