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Organization and Summary of Significant Accounting Policies (Fair Value Measurements and Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Assets at fair value and gains (losses) recorded |  |  |
Equipment held for sale | $ 23,454 | $ 18,114 |
Asset write-down | 9,181 | 5,602 | $ 6,461
Unamortized debt issuance cost | 12,600 | 15,500 |
Equipment |  |  |
Assets at fair value and gains (losses) recorded |  |  |
Asset write-down |  | 2,600 |
Asset helf-for-use write-down | 600 | 2,400 |
Engine Parts |  |  |
Assets at fair value and gains (losses) recorded |  |  |
Asset write-down | 2,800 | 600 |
Additional write-down | 300 |  |
Nonrecurring |  |  |
Assets at fair value and gains (losses) recorded |  |  |
Equipment held for sale | 4,932 | 3,364 |
Equipment held for lease | 2,154 | 10,787 |
Spare parts inventory |  | 2,371 |
Assets at fair value | 7,086 | 16,522 |
Total losses on equipment held for lease | (2,536) | (2,420) |
Total losses on equipment held for sale | (6,645) | (3,074) |
Total losses on spare parts inventory |  | (108) |
Total losses on assets | (9,181) | (5,602) |
Nonrecurring | Equipment |  |  |
Assets at fair value and gains (losses) recorded |  |  |
Asset write-down recorded earlier | 5,500 |  |
Nonrecurring | Level 2 |  |  |
Assets at fair value and gains (losses) recorded |  |  |
Equipment held for sale | 4,932 | 3,364 |
Equipment held for lease | 2,154 | 10,787 |
Spare parts inventory |  | 2,371 |
Assets at fair value | 7,086 | $ 16,522 |
Engines and related equipment | Nonrecurring |  |  |
Assets at fair value and gains (losses) recorded |  |  |
Asset write-down | $ 9,200 |  |

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