Employee Benefit Plans (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of Net Periodic Pension Cost and Other Amounts Recognized in Other Comprehensive Income (Pre-tax) [Abstract]
Defined Benefit Plan, Service Cost			$ 0	$ 0	$ 2,226,000
Defined Benefit Plan, Interest Cost			270,000	269,000	3,323,000
Amortization of deferred amounts (primarily prior actuarial losses)			272,000	109,000	4,891,000
Defined Benefit Plan, Expected Return on Plan Assets			(261,000)	(241,000)	(224,000)
Net periodic pension cost			281,000	137,000	10,216,000
Benefit Plan Termination and Related Costs		25,000,000	0	0	25,187,000
Net periodic pension costs and benefit plan termination and related costs			281,000	137,000	35,403,000
Defined Benefit Plan, Actuarial (Gains) Losses			753,000	1,145,000	(49,463,000)
Amortization of net (loss)			(272,000)	(110,000)	(4,891,000)
Total loss (gain) recognized in other comprehensive income			481,000	1,035,000	(54,354,000)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax			762,000	1,172,000	(18,951,000)
Defined Contribution Plan, Cost Recognized			8,900,000	6,500,000	5,600,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax					23,300,000
Defined Benefit Plan, Benefits Paid				75,000,000	58,000,000
Agreed upon separation agreement % interest earned on unpaid benefits for former President and Senior VP and Secretary				8.75%
gain on rabbi trust assets sold	3,600,000
future loss in other comprehensive income as a result of net periodic pension cost			300,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation			$ 300,000
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			4.30%	5.40%	3.80%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	15.00%				15.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets			6.00%	6.00%	6.00%
Actualrial Assumptions used to calulate benefit obligation, discount rate	5.40%		3.80%	4.30%	5.40%
Actuarial assumption used to calculate benefit obligation, expected rate of return on assets	6.00%		6.00%	6.00%	6.00%