Pension Benefit and Other Postretirement Benefit Plans (Change in Plan Assets) (Details) (USD $)	3 Months Ended		9 Months Ended		6 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013 Pension Benefits [Member]		Jun. 30, 2012 Pension Benefits [Member]	Sep. 30, 2013 Pension Benefits [Member]		Apr. 30, 2013 Pension Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year					$ 143,540,000	[1],[2]		$ 143,540,000	[1],[2]	$ 156,741,000	[2]
Actual return on plan assets					10,981,000	[1]
Employer contributions	0	6,300,000	0	6,300,000	6,500,000	[1]	16,000,000	13,000,000
Benefit payments					(3,642,000)	[1]
Settlement charge					0	[1]
Fair value of plan assets at the end of the period					157,379,000	[1]				156,741,000	[2]
Funded status					$ (34,057,000)	[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

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