Corporate Debt (Schedule Of Corporate Debt) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Long-term Debt, Total	$ 383,992,000
Stated interest rate	6.70%
Senior notes 6.70%, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt, Total	175,000,000	[1]		[1]
Stated interest rate	6.70%		6.70%
Debt instrument, maturity date	Jan. 01, 2022
Redemption price, percentage of principal amount	100.00%
Senior notes 5.375%, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt, Total	150,000,000	[2]		[2]
Due date	December 2022
Stated interest rate	5.375%		5.375%
Redemption price, percentage of principal amount	100.00%
Non-recourse debt, 6.75%, due 2016 [Member]
Debt Instrument [Line Items]
Long-term Debt, Total	58,992,000	[3]		[3]
Stated interest rate	6.75%		6.75%
Principal	60,000,000
Non recourse debt, percentage of montly lease payments required to be collected	100.00%
Non recourse debt, percentage of montly lease payments required to be allocated to interest	65.00%
Non Recourse Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Total	$ 58,992,000

[1] In January 2012, we sold in a registered underwritten public offering, $175.0 million in aggregate principal amount of 6.70% senior notes due January 2022. Interest on these senior notes is payable quarterly in arrears. On or after January 15, 2015, we may redeem some or all of the senior notes at any time at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued interest thereon to the redemption date.

[2] In December 2012, we sold in a registered underwritten public offering, $150.0 million in aggregate principal amount of 5.375% senior notes due December 2022. Interest on these senior notes is payable quarterly in arrears. On or after December 31, 2015, we may redeem some or all of the senior notes at any time at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued interest thereon to the redemption date.

[3] On December 17, 2012, we issued $60.0 million principal in non-recourse debt for the purpose of acquiring East Shore Aircraft LLC. Interest on the non-recourse debt is payable monthly. We are required to redeem some of the non-recourse debt as each aircraft is sold at the various lease expiration dates. We will collect 100% of the monthly lease payments with approximately 65% allocated to pay interest first then principal on non-recourse debt. In addition, as each aircraft is sold at the various lease expiration dates a portion of the proceeds will be applied to the principal balance of the non-recourse debt.