Employee Benefit Plans - AOCI Amortization in Next Fiscal Year (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of loss	$ 3,420
Amortization of prior service cost	13
Total amortization of AOCI loss	3,433
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of loss	0
Amortization of prior service cost	0
Total amortization of AOCI loss	$ 0