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Organization and Summary of Significant Accounting Policies Sales of Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease Transfers In Ending Accounts Receivable	$ 0.7
Lease Agreements [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	10.2	12.1
Lease Transfers In Ending Accounts Receivable			$ 0.7

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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