Pension and Other Post Retirement Benefit Plans - Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Pension Cost	$ 692	$ 1,167
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Pension Cost	692	1,167
Net gain (loss)	(11,942)	1,242
Actuarial gain (loss)	(2,131)	(2,207)
Amortization of prior service (cost) credit	(25)	(25)
Total Recognized in Other Comprehensive Income	(14,098)	(990)
Total Recognized in NPPC and OCI	$ (13,406)	$ 177