Pension and Other Post-Retirement Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits
Components of net periodic benefit cost:
Service cost	$ 350	$ 350	$ 500
Interest cost	746	820	1,935
Expected return on plan assets	(627)	(1,377)	(3,323)
Amortization of prior service cost	0	0	0
Recognized net actuarial loss	746	709	2,306
Settlement loss and special termination benefits	122	879	381
Subtotal	1,337	1,381	1,799
Net periodic benefit cost of discontinued operations	0	0	1,552
Net periodic benefit cost of discontinued operations	1,337	1,381	247
Other Benefits
Components of net periodic benefit cost:
Service cost	762	669	905
Interest cost	634	693	1,110
Expected return on plan assets	0	0	0
Amortization of prior service cost	(306)	(446)	(845)
Recognized net actuarial loss	793	879	1,760
Settlement loss and special termination benefits	0	0	0
Subtotal	1,883	1,795	2,930
Net periodic benefit cost of discontinued operations	0	0	1,356
Net periodic benefit cost of discontinued operations	$ 1,883	$ 1,795	$ 1,574