Finance Assets Finance Assets 2 (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Leveraged Leases [Line Items]
Rental receivables	$ 83,254,000	$ 810,306,000	$ 83,254,000	$ 810,306,000
Unguaranteed residual values	14,177,000	13,784,000	14,177,000	13,784,000
Principal and interest on non-recourse loans	(55,092,000)	(606,708,000)	(55,092,000)	(606,708,000)
Unearned income	(7,793,000)	(79,111,000)	(7,793,000)	(79,111,000)
Investment in leveraged leases	34,546,000	138,271,000	34,546,000	138,271,000
Less: Deferred taxes related to leveraged leases	(19,372,000)	(101,255,000)	(19,372,000)	(101,255,000)
Net investment in leveraged leases	15,174,000	37,016,000	15,174,000	37,016,000
Leverage Lease Investment Book Value Sold	109,000,000		109,000,000
Gain on sale of leveraged lease assets, net of tax	$ 13,000,000	$ 27,000,000	$ 12,886,000	$ 26,689,000	$ 0