Secured and Unsecured Debt Financings (Details) $ in Thousands	Jun. 30, 2017 USD ($) Aircraft	Dec. 31, 2016 USD ($)
Outstanding amounts of secured and unsecured term debt financings
Borrowings from secured financings	$ 1,055,610	$ 1,219,034
Number of Aircraft Financed \| Aircraft	33
Borrowings from unsecured financings, net of debt issuance costs	$ 3,283,747	3,287,211
Total secured and unsecured debt financings	4,339,357	4,506,245
Line of Credit \| Revolving Credit Facility [Member]
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net of debt issuance costs		0
2013 Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility [Member]
Outstanding amounts of secured and unsecured term debt financings
Line of Credit Facility, Fair Value of Amount Outstanding	$ 0
ECA Term Financings {Member] \| Secured Debt
Outstanding amounts of secured and unsecured term debt financings
Number of Aircraft Financed \| Aircraft	7
ECA Term Financings {Member] \| Notes Payable, Other Payables
Outstanding amounts of secured and unsecured term debt financings
Borrowings from secured financings	$ 284,163	305,276
Bank Financings \| Secured Debt
Outstanding amounts of secured and unsecured term debt financings
Number of Aircraft Financed \| Aircraft	26
Bank Financings \| Notes Payable to Banks
Outstanding amounts of secured and unsecured term debt financings
Borrowings from secured financings	$ 787,843	933,541
Secured Debt
Outstanding amounts of secured and unsecured term debt financings
Debt Issuance Cost	(16,396)	(19,783)
Senior Notes Due 2017 \| Senior Notes
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net of debt issuance costs	$ 0	500,000
Interest rate	6.75%
Senior Notes Due 2018 with 4.625 Interest Rate \| Senior Notes
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net of debt issuance costs	$ 400,000	400,000
Interest rate	4.625%
Senior Notes Due 2019 \| Senior Notes
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net of debt issuance costs	$ 500,000	500,000
Interest rate	6.25%
Senior Notes Due 2020 \| Senior Notes
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net of debt issuance costs	$ 300,000	300,000
Interest rate	7.625%
Senior Notes due 2021 \| Senior Notes
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net of debt issuance costs	$ 500,000	500,000
Interest rate	5.125%
Senior Notes Due 2022 [Member] \| Senior Notes
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net of debt issuance costs	$ 500,000	500,000
Interest rate	5.50%
Senior Notes Due 2023 [Member] \| Senior Notes
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net of debt issuance costs	$ 500,000	500,000
Interest rate	5.00%
Senior Notes Due 2024 [Member] \| Senior Notes
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net of debt issuance costs	$ 500,000	0
Interest rate	4.125%
Floating Rate Term Loan [Member] \| Floating Rate Term Loan [Member]
Outstanding amounts of secured and unsecured term debt financings
Borrowings from unsecured financings, net of debt issuance costs	$ 120,000	120,000
Interest rate	3.2456%
Unsecured Debt
Outstanding amounts of secured and unsecured term debt financings
Debt Issuance Cost	$ (36,253)	$ (32,789)
Minimum [Member] \| ECA Term Financings {Member] \| Notes Payable, Other Payables
Outstanding amounts of secured and unsecured term debt financings
Interest rate	3.02%
Minimum [Member] \| Bank Financings \| Notes Payable to Banks
Outstanding amounts of secured and unsecured term debt financings
Interest rate	2.12%
Maximum \| ECA Term Financings {Member] \| Notes Payable, Other Payables
Outstanding amounts of secured and unsecured term debt financings
Interest rate	3.96%
Maximum \| Bank Financings \| Notes Payable to Banks
Outstanding amounts of secured and unsecured term debt financings
Interest rate	4.45%

Number of Aircraft Financed

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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