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