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Organization and Summary of Significant Accounting Policies Lease Transfers to 3rd party lessors during period (Details) (Lease Agreements [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Lease Agreements [Member]
Third Party Lease Transfers [Line Items]
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	$ 14.6	$ 9.0	$ 42.5	$ 32.2
Lease transfers in ending A/R	$ 0.8		$ 0.8		$ 0.2

Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

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