Retirement Plans (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 68	$ 70	$ 136	$ 140
Expected return on assets	(83)	(93)	(166)	(185)
Amortization of actuarial net loss	22	11	44	22
Net periodic pension (benefit) cost	7	(12)	14	(23)
Company contributions	$ 70	$ 72	$ 148	$ 152