XML 57 R27.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Interest Expense (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Interest Expense |
Schedule of components of interest | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​ | Year Ended | ​ | Year Ended
​ | ​ | December 31, 2019 | ​ | December 31, 2018 | ​ | December 31, 2017
​ | ​ | (in thousands)
Interest on borrowings |  | $ | 456,678 |  | $ | 362,843 |  | $ | 303,966
Less capitalized interest | ​ |  | (59,358) | ​ |  | (52,817) | ​ |  | (46,049)
Interest | ​ |  | 397,320 | ​ |  | 310,026 | ​ |  | 257,917
Amortization of discounts and deferred debt issue costs | ​ |  | 36,691 | ​ |  | 32,706 | ​ |  | 29,454
Interest expense | ​ | $ | 434,011 | ​ | $ | 342,732 | ​ | $ | 287,371

X
- Definition Tabular disclosure of components of interest expense. + References No definition available. + Details
Name: | al_ScheduleOfInterestExpenseTableTextBlock
Namespace Prefix: | al_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InterestExpenseAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration