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, 2016		$ 150,000	$ 28,224	$ (14,376)	$ 821,023	$ (23,216)	$ 2,876,636
Common shares issued (redeemed), net			1		(168)
Share compensation expenses					9,491
Other comprehensive (loss) income	$ 763					763
Amounts reclassified from accumulated other comprehensive loss	0
Net income	139,336						139,336
Net (income) attributable to noncontrolling interests	(42,572)						(42,572)
Dividends on common shares							(31,063)
Dividends on preferred shares							(2,203)
Balance - End of period at Mar. 31, 2017	3,911,876	150,000	28,225	(14,376)	830,346	(22,453)	2,940,134
Noncontrolling interests at Mar. 31, 2017	330,597
Total shareholders' equity at Mar. 31, 2017	4,242,473
Balance - Beginning of period at Dec. 31, 2017	3,895,072	400,000	28,349	(14,468)	814,641	(22,192)	2,688,742
Common shares issued (redeemed), net			2		(14)
Share compensation expenses					9,729
Other comprehensive (loss) income	30,562					30,562
Amounts reclassified from accumulated other comprehensive loss						1,035
Net income	66,462						66,462
Net (income) attributable to noncontrolling interests	(64,712)						(64,712)
Dividends on common shares							(31,076)
Dividends on preferred shares							(5,828)
Balance - End of period at Mar. 31, 2018	3,901,232	$ 400,000	$ 28,351	$ (14,468)	$ 824,356	$ 9,405	$ 2,653,588
Noncontrolling interests at Mar. 31, 2018	334,357
Total shareholders' equity at Mar. 31, 2018	$ 4,235,589