Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accumulated depreciation on flight equipment held for lease	$ 1,371,515	$ 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	74,983,114	75,454,511
Common shares, shares outstanding	74,983,114	75,324,989
Preference shares, par value	$ 0.01	$ 0.01
Preference shares, shares authorized	50,000,000	50,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0