Pension Plans and Other Postretirement Benefits (Details 5) - Postretirement Benefit Costs [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Components of net periodic benefit:
Service cost	$ 0	$ 0
Interest cost	46	92
Curtailment gain	(713)	0
Settlement gain	(1,439)	0
Amortization of prior service cost	(628)	(52)
Amortization of prior gain	(246)	(236)
Net periodic income	$ (2,980)	$ (196)