Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred shares	Common shares	Treasury shares	Additional paid-in capital	Accumulated other comprehensive loss	Retained earnings
Balance - Beginning of period at Dec. 31, 2014		$ 0	$ 27,222	$ (12,545)	$ 1,207,493	$ (8,556)	$ 2,372,972
Preferred shares issued		0
Offering expenses on preferred shares					0
Common shares issued, net			504		16,231
Repurchase of common shares				(831)	(203,086)
Share compensation expenses					28,279
Other comprehensive (loss) income	$ (2,313)					(2,313)
Net income	372,819						372,819
Net (income) attributable to noncontrolling interest	(66,968)						(66,968)
Dividends on preferred shares							0
Dividends on common shares							(86,256)
Balance - End of period at Sep. 30, 2015	3,644,965	0	27,726	(13,376)	1,048,917	(10,869)	2,592,567
Noncontrolling interest at Sep. 30, 2015	159,116
Total shareholders' equity at Sep. 30, 2015	3,804,081
Balance - Beginning of period at Dec. 31, 2015	3,638,975	0	28,100	(13,592)	1,002,980	(12,569)	2,634,056
Preferred shares issued		150,000
Offering expenses on preferred shares					(5,148)
Common shares issued, net			123		(7,754)
Repurchase of common shares				(728)	(195,287)
Share compensation expenses					32,465
Other comprehensive (loss) income	(8,523)					(8,523)
Net income	450,032						450,032
Net (income) attributable to noncontrolling interest	(96,163)						(96,163)
Dividends on preferred shares							(2,252)
Dividends on common shares							(88,120)
Balance - End of period at Sep. 30, 2016	3,867,620	$ 150,000	$ 28,223	$ (14,320)	$ 827,256	$ (21,092)	$ 2,897,553
Noncontrolling interest at Sep. 30, 2016	222,996
Total shareholders' equity at Sep. 30, 2016	$ 4,090,616