Comprehensive Income (Details 3) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Amortization of defined benefit pension items
Amortization of defined benefit pension items, Prior service cost	[1]			$ (56)
Amortization of defined benefit pension items, Actuarial losses	[1]			946
Amortization of defined benefit pension items, Total before tax				890
Amortization of defined benefit pension items, Tax benefit				(347)
Amortization of defined benefit pension items, Net of tax		$ 272	$ 96	$ 543	$ 216

[1] These amounts were included in the computation of net periodic pension cost. See Note 6 for additional details.