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Operating Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Operating segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | item |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease rent revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 119,895 | $ 108,046 | $ 101,431
Maintenance reserve revenue |  |  |  |  |  |  |  |  |  |  |  |  | 57,091 | 53,396 | 53,322
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  | 17,783 | 25,582 | 8,917
Gain on sale of leased equipment |  |  |  |  |  |  |  |  |  |  |  |  | 3,482 | 8,320 | 5,882
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  | 9,023 | 2,718 | 4,506
Total revenue | $ 55,476 | $ 51,461 | $ 49,618 | $ 50,719 | $ 55,186 | $ 57,730 | $ 43,810 | $ 41,336 | $ 41,205 | $ 45,519 | $ 43,994 | $ 43,340 | 207,274 | 198,062 | 174,058
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 66,280 | 69,424 | 65,314
Cost Of Spare Parts and Equipment Sales |  |  |  |  |  |  |  |  |  |  |  |  | 13,293 | 17,849 | 7,474
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  | 47,780 | 42,744 | 35,859
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | 41,144 | 39,012 | 37,062
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  | 41,281 | 37,861 | 37,062
Other expense |  |  |  |  |  |  |  |  |  |  |  |  | 16,507 | 18,584 | 17,938
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  | 185,141 | 186,462 | 163,647
Earnings from operations |  |  |  |  |  |  |  |  |  |  |  |  | 22,133 | 11,600 | 10,411
Total assets | 1,337,887 |  |  |  | 1,294,285 |  |  |  | 1,245,841 |  |  |  | 1,337,887 | 1,294,285 | 1,245,841
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  | (1,635) | (458) | (736)
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | (1,635) | (458) | (736)
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from operations |  |  |  |  |  |  |  |  |  |  |  |  | (1,635) | (458) | (736)
Leasing and Related Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease rent revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 108,046 |
Maintenance reserve revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,396 |
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,975 |
Gain on sale of leased equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,320 |
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,517 |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 182,254 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 69,135 |
Cost Of Spare Parts and Equipment Sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,734 |
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,974 |
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,474 |
Other expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,584 |
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 170,901 |
Earnings from operations |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,353 |
Leasing and Related Operations | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease rent revenue |  |  |  |  |  |  |  |  |  |  |  |  | 119,895 |  | 101,431
Maintenance reserve revenue |  |  |  |  |  |  |  |  |  |  |  |  | 57,091 |  | 53,322
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  | 3,335 |  |
Gain on sale of leased equipment |  |  |  |  |  |  |  |  |  |  |  |  | 3,482 |  | 5,882
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  | 8,711 |  | 3,581
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 192,514 |  | 164,216
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 65,939 |  | 65,025
Cost Of Spare Parts and Equipment Sales |  |  |  |  |  |  |  |  |  |  |  |  | 2,394 |  |
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  | 44,703 |  | 33,211
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,779
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  | 40,813 |  |
Other expense |  |  |  |  |  |  |  |  |  |  |  |  | 16,507 |  | 17,830
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  | 170,356 |  | 152,845
Earnings from operations |  |  |  |  |  |  |  |  |  |  |  |  | 22,158 |  | 11,371
Total assets | 1,307,460 |  |  |  | 1,267,414 |  |  |  | 1,226,701 |  |  |  | 1,307,460 | 1,267,414 | 1,226,701
Spare Parts Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,607 |
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 659 |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,266 |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 289 |
Cost Of Spare Parts and Equipment Sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,115 |
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,770 |
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 387 |
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,561 |
Earnings from operations |  |  |  |  |  |  |  |  |  |  |  |  |  | 705 |
Spare Parts Sales | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  | 14,448 |  | 8,917
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,947 |  | 1,661
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 16,395 |  | 10,578
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 341 |  | 289
Cost Of Spare Parts and Equipment Sales |  |  |  |  |  |  |  |  |  |  |  |  | 10,899 |  | 7,474
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  | 3,077 |  | 2,648
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 283
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  | 468 |  |
Other expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  | 14,785 |  | 10,802
Earnings from operations |  |  |  |  |  |  |  |  |  |  |  |  | 1,610 |  | (224)
Total assets | $ 30,427 |  |  |  | $ 26,871 |  |  |  | $ 19,140 |  |  |  | $ 30,427 | $ 26,871 | $ 19,140

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