Pensions and Other Postretirement Benefits (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 361,000	$ 394,000	$ 1,103,000	$ 1,178,000
Interest cost	439,000	417,000	1,341,000	1,248,000
Expected return on plan assets	(326,000)	(321,000)	(995,000)	(961,000)
Amortization of transition asset	(21,000)	(21,000)	(65,000)	(65,000)
Amortization of prior service cost	2,000	39,000	5,000	119,000
Amortization of actuarial loss	135,000	117,000	405,000	351,000
Net periodic pension cost	590,000	625,000	1,794,000	1,870,000
Contributions by employer			$ 1,700,000