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Reportable Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | 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, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Reportable Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | item |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease rent revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 130,369 | $ 119,895 | $ 108,046
Maintenance reserve revenue |  |  |  |  |  |  |  |  |  |  |  |  | 80,189 | 57,091 | 53,396
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  | 51,423 | 17,783 | 25,582
Gain on sale of leased equipment |  |  |  |  |  |  |  |  |  |  |  |  | 4,929 | 3,482 | 8,320
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  | 7,930 | 9,023 | 2,718
Total revenue | $ 63,189 | $ 65,861 | $ 67,844 | $ 77,946 | $ 55,476 | $ 51,461 | $ 49,618 | $ 50,719 | $ 55,186 | $ 57,730 | $ 43,810 | $ 41,336 | 274,840 | 207,274 | 198,062
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 66,023 | 66,280 | 69,424
Cost of spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  | 40,848 | 13,293 | 17,849
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  | 55,737 | 47,780 | 42,744
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,861
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  | 48,720 | 41,281 | 37,861
Other expense |  |  |  |  |  |  |  |  |  |  |  |  | 34,659 | 16,507 | 18,584
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  | 245,987 | 185,141 | 186,462
Earnings from operations |  |  |  |  |  |  |  |  |  |  |  |  | 28,853 | 22,133 | 11,600
Total assets | 1,603,431 |  |  |  | 1,337,887 |  |  |  | 1,294,285 |  |  |  | 1,603,431 | 1,337,887 | 1,294,285
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  | (1,373) | (1,635) | (458)
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | (1,373) | (1,635) | (458)
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from operations |  |  |  |  |  |  |  |  |  |  |  |  | (1,373) | (1,635) | (458)
Leasing and Related Operations | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease rent revenue |  |  |  |  |  |  |  |  |  |  |  |  | 130,369 | 119,895 | 108,046
Maintenance reserve revenue |  |  |  |  |  |  |  |  |  |  |  |  | 80,189 | 57,091 | 53,396
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  | 22,285 | 3,335 | 9,975
Gain on sale of leased equipment |  |  |  |  |  |  |  |  |  |  |  |  | 4,929 | 3,482 | 8,320
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  | 7,702 | 8,711 | 2,517
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 245,474 | 192,514 | 182,254
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 65,677 | 65,939 | 69,135
Cost of spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  | 17,344 | 2,394 | 5,734
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  | 52,024 | 44,703 | 39,974
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,474
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  | 48,720 | 40,813 |
Other expense |  |  |  |  |  |  |  |  |  |  |  |  | 34,659 | 16,507 | 18,584
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  | 218,424 | 170,356 | 170,901
Earnings from operations |  |  |  |  |  |  |  |  |  |  |  |  | 27,050 | 22,158 | 11,353
Total assets | 1,580,094 |  |  |  | 1,307,460 |  |  |  | 1,267,414 |  |  |  | 1,580,094 | 1,307,460 | 1,267,414
Spare Parts Sales | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  | 29,138 | 14,448 | 15,607
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,601 | 1,947 | 659
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 30,739 | 16,395 | 16,266
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 346 | 341 | 289
Cost of spare parts and equipment sales |  |  |  |  |  |  |  |  |  |  |  |  | 23,504 | 10,899 | 12,115
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  | 3,713 | 3,077 | 2,770
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 387
Net finance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 468 |
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  | 27,563 | 14,785 | 15,561
Earnings from operations |  |  |  |  |  |  |  |  |  |  |  |  | 3,176 | 1,610 | 705
Total assets | $ 23,337 |  |  |  | $ 30,427 |  |  |  | $ 26,871 |  |  |  | $ 23,337 | $ 30,427 | $ 26,871

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