Allowance For Credit Losses (Narrative) (Details) (Operating Leases [Member], Accounts Receivable Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Operating Leases [Member] | Accounts Receivable Allowance for Doubtful Accounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ 10