Segment and Geographic Information - Geographic Allocation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Geographic Segment Information
Total leasing revenues	$ 327,757	$ 336,668	$ 970,622	$ 1,016,093
Equipment trading revenues	26,094	25,796	58,377	66,833
Asia
Geographic Segment Information
Total leasing revenues	115,084	133,787	353,464	405,592
Equipment trading revenues	7,546	4,814	12,232	11,799
Europe
Geographic Segment Information
Total leasing revenues	175,629	164,197	503,106	490,190
Equipment trading revenues	6,329	9,756	16,542	22,187
Americas
Geographic Segment Information
Total leasing revenues	25,055	28,701	81,668	90,391
Equipment trading revenues	8,316	8,827	21,755	24,880
Bermuda
Geographic Segment Information
Total leasing revenues	450	515	1,331	1,732
Equipment trading revenues	0	0	0	0
Other international
Geographic Segment Information
Total leasing revenues	11,539	9,468	31,053	28,188
Equipment trading revenues	$ 3,903	$ 2,399	$ 7,848	$ 7,967