Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accumulated depreciation on flight equipment held for lease	$ 1,207,844	$ 1,306,024
Borrowings from secured financings	$ 1,078,823	$ 1,146,238
Common shares, par value	$ 0.01	$ 0.01
Common shares, shares authorized	250,000,000	250,000,000
Common shares, shares issued	78,777,771	80,232,260
Common shares, shares outstanding	78,777,771	80,232,260
Preference shares, par value	$ 0.01	$ 0.01
Preference shares, shares authorized	50,000,000	50,000,000