Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accumulated depreciation on flight equipment held for lease	$ 1,501,664	$ 1,221,985
Common shares, par value	$ 0.01	$ 0.01
Common shares, shares authorized	250,000,000	250,000,000
Common shares, shares issued	74,991,025	75,454,511
Common shares, shares outstanding	74,991,025	75,454,511
Preference shares, par value	$ 0.01	$ 0.01
Preference shares, shares authorized	50,000,000	50,000,000
Preference shares, shares issued	0	0
Preference shares, shares outstanding	0	0