Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	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			494		14,366
Repurchase of common shares				(595)	(142,628)
Share compensation expenses					18,296
Dividends on preferred shares							0
Dividends on common shares							(57,874)
Other comprehensive (loss) income	$ (510)					(510)
Net income	279,940						279,940
Net (income) attributable to noncontrolling interest	(40,739)						(40,739)
Balance - End of period at Jun. 30, 2015	3,657,336	0	27,716	(13,140)	1,097,527	(9,066)	2,554,299
Noncontrolling interest at Jun. 30, 2015	153,523
Total shareholders' equity at Jun. 30, 2015	3,810,859
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			119		(7,504)
Repurchase of common shares				(492)	(128,591)
Share compensation expenses					21,964
Dividends on preferred shares							0
Dividends on common shares							(59,227)
Other comprehensive (loss) income	(5,613)					(5,613)
Net income	320,497						320,497
Net (income) attributable to noncontrolling interest	(58,724)						(58,724)
Balance - End of period at Jun. 30, 2016	3,866,256	$ 150,000	$ 28,219	$ (14,084)	$ 883,701	$ (18,182)	$ 2,836,602
Noncontrolling interest at Jun. 30, 2016	212,154
Total shareholders' equity at Jun. 30, 2016	$ 4,078,410