Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments		$ 52,550
Defined Benefit Plan, Actuarial Gain (Loss)		71,008
Components of net periodic benefit cost
Contributions to qualified and non qualified pension plans	5,000		8,674	2,662
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	732	2,647	2,196	9,308
Interest cost	5,751	6,865	17,251	20,778
Expected return on plan assets	(6,450)	(9,017)	(19,348)	(26,622)
Amortization of prior service benefit	(39)	(136)	(117)	(99)
Recognized net actuarial loss	756	2,529	2,268	13,385
Curtailment loss (1)	0	809	0	1,968	[1]
Net periodic pension benefit cost	750	3,697	2,250	18,718
Other Benefits [Member]
Components of net periodic benefit cost
Service cost	0	0	0	0
Interest cost	157	157	471	471
Expected return on plan assets	0	0	0	0
Amortization of prior service benefit	(56)	(122)	(169)	(366)
Recognized net actuarial loss	50	105	151	317
Curtailment loss (1)	0	0	0	0
Net periodic pension benefit cost	$ 151	$ 140	$ 453	$ 422

[1] Curtailment loss during the first nine months ended September 30, 2013 resulted from the departure of certain executive officers and was recorded within selling and administrative expense in the condensed consolidated statement of operations.