Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common shares	Treasury shares	Additional paid-in capital	Accumulated other comprehensive loss	Retained earnings
Total shareholders' equity					$ (2,953)
Balance - Beginning of period at Dec. 31, 2012		$ 26,722	$ (7,836)	$ 2,160,478	(2,953)	$ 1,844,416
Common shares issued, net		314		898
Repurchase of common shares			(2,392)	(511,112)
Share compensation expenses				27,630
Dividends						(362,783)
Net income	$ 595,148					595,148
Net (income) attributable to noncontrolling interest	(62,482)					(62,482)
Amounts reclassified to retained earnings					4,290	(4,290)
Other comprehensive loss	(1,954)				(1,954)
Balance - End of period at Dec. 31, 2013	3,704,094	27,036	(10,228)	1,677,894	(617)	2,010,009
Noncontrolling interest	375,026
Total shareholders' equity	4,079,120				(617)
Common shares issued, net		186		5,161
Repurchase of common shares			(2,317)	(508,635)
Share compensation expenses				33,073
Dividends						(117,000)
Net income	554,843					554,843
Net (income) attributable to noncontrolling interest	(74,880)					(74,880)
Amounts reclassified to retained earnings					0	0
Other comprehensive loss	(7,939)				(7,939)
Balance - End of period at Dec. 31, 2014	3,586,586	27,222	(12,545)	1,207,493	(8,556)	2,372,972
Noncontrolling interest	292,274
Total shareholders' equity	3,878,860				(8,556)
Common shares issued, net		878		16,529
Repurchase of common shares			(1,047)	(259,383)
Share compensation expenses				38,341
Dividends						(113,809)
Net income	467,857					467,857
Net (income) attributable to noncontrolling interest	(92,964)					(92,964)
Amounts reclassified to retained earnings					0	0
Other comprehensive loss	(4,013)				(4,013)
Balance - End of period at Dec. 31, 2015	3,638,975	$ 28,100	$ (13,592)	$ 1,002,980	(12,569)	$ 2,634,056
Noncontrolling interest	154,662
Total shareholders' equity	$ 3,793,637				$ (12,569)