Pension and Other Postretirement Plans (Plan Assets) (Details) (USD $)	12 Months Ended																																					3 Months Ended
	Dec. 31, 2012 Defined Benefit Pension Plans [Member] investments	Dec. 31, 2011 Defined Benefit Pension Plans [Member]	Dec. 31, 2010 Defined Benefit Pension Plans [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Level 1 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Level 2 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Level 3 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Cash and cash equivalents [Member]	Dec. 31, 2011 Defined Benefit Pension Plans [Member] Cash and cash equivalents [Member]	Dec. 31, 2010 Defined Benefit Pension Plans [Member] Cash and cash equivalents [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Cash and cash equivalents [Member] Level 1 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Cash and cash equivalents [Member] Level 2 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Cash and cash equivalents [Member] Level 3 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Equity Securities [Member]	Dec. 31, 2011 Defined Benefit Pension Plans [Member] Equity Securities [Member]	Dec. 31, 2010 Defined Benefit Pension Plans [Member] Equity Securities [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Equity - Domestic [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Equity - Domestic [Member] Level 1 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Equity - Domestic [Member] Level 2 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Equity - Domestic [Member] Level 3 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Equity - International [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Equity - International [Member] Level 1 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Equity - International [Member] Level 2 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Equity - International [Member] Level 3 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] U.S. government agencies [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] U.S. government agencies [Member] Level 1 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] U.S. government agencies [Member] Level 2 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] U.S. government agencies [Member] Level 3 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Corporate bonds [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Corporate bonds [Member] Level 1 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Corporate bonds [Member] Level 2 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Corporate bonds [Member] Level 3 [Member]	Dec. 31, 2012 Defined Benefit Pension Plans [Member] Debt securities [Member]	Dec. 31, 2011 Defined Benefit Pension Plans [Member] Debt securities [Member]	Dec. 31, 2010 Defined Benefit Pension Plans [Member] Debt securities [Member]	Dec. 31, 2012 Chairman and President Non-Qualified Defined Benefit Plans [Member]	Dec. 31, 2011 Chairman and President Non-Qualified Defined Benefit Plans [Member]	Dec. 31, 2010 Chairman and President Non-Qualified Defined Benefit Plans [Member]	Dec. 31, 2012 Minimum [Member] Defined Benefit Pension Plans [Member] Cash and cash equivalents [Member]	Dec. 31, 2012 Minimum [Member] Defined Benefit Pension Plans [Member] Equity Securities [Member]	Dec. 31, 2012 Minimum [Member] Defined Benefit Pension Plans [Member] Debt securities [Member]	Dec. 31, 2012 Maximum [Member] Defined Benefit Pension Plans [Member] Cash and cash equivalents [Member]	Dec. 31, 2012 Maximum [Member] Defined Benefit Pension Plans [Member] Equity Securities [Member]	Dec. 31, 2012 Maximum [Member] Defined Benefit Pension Plans [Member] Debt securities [Member]
Pension plan assets within the fair value hierachy
Fair value of plan assets	$ 16,813,000	$ 15,688,000	$ 16,136,000	$ 10,986,000	$ 5,827,000	$ 0	$ 885,000			$ 885,000	$ 0	$ 0				$ 9,900,000	$ 9,900,000	$ 0	$ 0	$ 201,000	$ 201,000	$ 0	$ 0	$ 403,000	$ 0	$ 403,000	$ 0	$ 5,424,000	$ 0	$ 5,424,000	$ 0				$ 0	$ 0	$ 0
Plan’s weighted-average asset allocations by asset category
Actual plan asset allocations	100.00%	100.00%	100.00%				5.00%	10.00%	6.00%				60.00%	57.00%	62.00%																	35.00%	33.00%	32.00%
Defined Benefit Plan, Assets for Plan Benefits [Abstract]
Planned assets	$ 0	$ 0																																	$ 0	$ 0
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage pension assets not invested in cash or U.S. Government agencies	93.00%
Numer of different investments	208
Maximum credit representing the fair vlaue of the portfolio	0.024
Acceptable range for each asset class																																						0.00%	55.00%	30.00%	15.00%	65.00%	40.00%