Pension Plan and Employee Benefits, Unobservable Input Reconciliation (Details) (Level 3 [Member], Pension Benefits [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair value of plan assets [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 19,668	$ 19,928	$ 19,241
Realized gain	12	2
Unrealized gain	199	864
Purchases	459	258
Sales	(930)	(437)
Real estate funds [Member]
Fair value of plan assets [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	17,928	17,341	16,349
Realized gain	0	0
Unrealized gain	128	734
Purchases	459	258
Sales	0	0
Hedge Funds [Member]
Fair value of plan assets [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	1,740	2,587	2,892
Realized gain	12	2
Unrealized gain	71	130
Purchases	0	0
Sales	$ (930)	$ (437)