Organization and Summary of Significant Accounting Policies (Fair Value on a Nonrecurring Basis) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) engine aircraft	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) engine aircraft	Sep. 30, 2016 USD ($) engine	Dec. 31, 2016 USD ($)
Assets at fair value and gains (losses) recorded
Equipment held for sale	$ 32,798		$ 32,798		$ 30,710
Asset write-down	6,958	$ 1,995	22,243	$ 5,924
Additional write-down				2,000
Additional write down to reflect the estimated market value				1,900
Other Income	2,549	1,622	6,439	$ 3,614
Gain on insurance settlement			1,288
Engine Parts
Assets at fair value and gains (losses) recorded
Number of engines for which impairment is recorded earlier due to part out and sale | engine				1
Asset write-down				$ 2,000
Additional write-down			5,500
Engine and aircraft
Assets at fair value and gains (losses) recorded
Asset write-down			16,700
Nonrecurring
Assets at fair value and gains (losses) recorded
Equipment held for lease	11,483	337	11,483	337
Equipment held for sale	32,758	589	32,758	589
Spare parts inventory	26,847	1,731	26,847	1,731
Assets at fair value	71,088	2,657	71,088	2,657
Total losses on equipment held for lease			(9,019)	(1,893)
Total losses on equipment held for sale			(7,681)	(3,556)
Total losses on spare parts inventory			(5,543)	(475)
Total losses on assets			(22,243)	(5,924)
Nonrecurring | Level 2
Assets at fair value and gains (losses) recorded
Equipment held for lease	11,483	337	11,483	337
Equipment held for sale	32,758	589	32,758	589
Spare parts inventory	26,847	1,731	26,847	1,731
Assets at fair value	$ 71,088	$ 2,657	$ 71,088	$ 2,657
Engines and related equipment
Assets at fair value and gains (losses) recorded
Number of engines | engine	7		7
Number of aircraft | aircraft	3		3