Organization and Summary of Significant Accounting Policies (Fair Value on a Nonrecurring Basis) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) engine aircraft	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) engine aircraft	Jun. 30, 2016 USD ($) engine	Dec. 31, 2016 USD ($)
Assets at fair value and gains (losses) recorded
Equipment held for sale	$ 27,826		$ 27,826		$ 30,710
Asset write-down	2,277	$ 1,893	15,285	$ 3,929
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				2
Asset write-down				$ 3,900
Additional write-down			1,800
Nonrecurring
Assets at fair value and gains (losses) recorded
Equipment held for lease	11,483	758	11,483	758
Equipment held for sale	27,547	1,448	27,547	1,448
Spare parts inventory	21,275		21,275
Assets at fair value	60,305	2,206	60,305	2,206
Total losses on equipment held for lease			(9,019)	(1,893)
Total losses on equipment held for sale			(4,423)	(2,036)
Total losses on spare parts inventory			(1,843)
Total losses on assets			(15,285)	(3,929)
Nonrecurring | Level 2
Assets at fair value and gains (losses) recorded
Equipment held for lease	11,483	758	11,483	758
Equipment held for sale	27,547	1,448	27,547	1,448
Spare parts inventory	21,275		21,275
Assets at fair value	$ 60,305	$ 2,206	$ 60,305	$ 2,206
Engines and related equipment
Assets at fair value and gains (losses) recorded
Number of engines | engine	4		4
Number of aircraft | aircraft	3		3
Asset write-down			$ 13,400