Defined Benefit Pension Plans Schedule of Net Periodic Pension Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Net Periodic Pension Benefit Costs [Line Items]
Service cost	$ 904	$ 723	$ 3,162	$ 2,750
Interest cost	595	871	1,820	2,661
Expected return on plan assets	(122)	(158)	(387)	(478)
Settlements and other	375	6	374	33
Amortization of actuarial net loss	488	118	1,470	363
Amortization of unrecognized prior service costs	14	17	43	53
Net periodic benefit cost	$ 2,254	$ 1,577	$ 6,482	$ 5,382