Schedule I Condensed Parent Company Financial Statements - Balance Sheet Parenthetical (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred financing costs, accumulated amortization (in dollars)	$ 11,213	$ 8,475
Preference shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preference shares, authorized shares	200,000,000	200,000,000
Preference shares, issued shares	0	0
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized shares	2,000,000,000	2,000,000,000
Common shares, issued shares	395,859,061	393,902,643
Treasury stock shares	9,101,395	8,812,054
Parent company
Deferred financing costs, accumulated amortization (in dollars)	$ 11,213	$ 8,475
Preference shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preference shares, authorized shares	200,000,000	200,000,000
Preference shares, issued shares	0	0
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized shares	2,000,000,000	2,000,000,000
Treasury stock shares	9,101,395	8,812,054