Pension and Other Post-Retirement Benefit Plans (Net Periodic Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 0	$ 0	$ 0
Interest cost	35,957	37,089	37,163
Expected return on plan assets	(45,990)	(39,882)	(39,027)
Amortization of prior service cost	0	0	0
Amortization of net (gain) loss	12,296	10,681	2,700
Net periodic benefit cost	2,263	7,888	836
Post-Retirement Healthcare Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	275	269	247
Interest cost	264	379	389
Expected return on plan assets	0	0	0
Amortization of prior service cost	419	433	529
Amortization of net (gain) loss	(5,654)	(5,552)	(5,552)
Net periodic benefit cost	$ (4,696)	$ (4,471)	$ (4,387)