Pension Benefit and Other Postretirement Benefit Plans (Change in Benefit Obligation) (Details) (Pension Benefits [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended		9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Jun. 30, 2013		Sep. 30, 2013		Sep. 30, 2012
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 191,436	[1]		$ 209,844	[1]	$ 209,844	[1]
Service cost	132		1,150	2,210	[1]	2,342		3,447
Interest cost	1,869		2,094	4,015	[1]	5,884		6,336
Actuarial (gain) loss				1,658	[1]
Benefit payments				(3,642)	[1]
Curtailment charge				(22,649)	[1]
Special termination benefit				0	[1]
Benefit obligation at end of the period				$ 191,436	[1]

[1] This calculation was performed as of June 30, 2013 due to the pension freeze and we are not otherwise required to perform the calculation at interim periods