Organization and Summary of Significant Accounting Policies Sales of Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Document Period End Date	Jun. 30, 2013
Lease Transfers In Ending Accounts Receivable	$ 0.8		$ 0.8
Lease Agreements [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	10.6	15.7	20.9	27.8
Lease Transfers In Ending Accounts Receivable					$ 0.7