Pension Benefits (Net Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net periodic pension cost
Service cost	$ 400	$ 430	$ 800	$ 860
Interest cost	325	331	650	662
Expected return on plan assets	$ (525)	(498)	$ (1,050)	(996)
Amortization of prior year service cost		(5)		(10)
Recognized net actuarial loss	$ 300	272	$ 600	544
Net periodic pension cost	$ 500	$ 530	$ 1,000	$ 1,060