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
Mar. 31, 2013	Mar. 31, 2012
Lease Agreements [Member]
Third Party Lease Transfers [Line Items]
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	$ 10.2	$ 12.1

- Definition

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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