SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2019

SHARE-BASED COMPENSATION

Summary of share option activity

				Weighted
		Weighted		average
		average		remaining	Aggregate
	Number	exercise		contractual	intrinsic value
	of shares	price		life (years)	(thousands)
Outstanding at December 31, 2016	5,794,831	US$	30.58	3.36	US$	19,272
Granted	1,279,872	US$	56.68
Exercised	(2,147,819)	US$	29.04
Forfeited	(119,902)	US$	32.64
Outstanding at December 31, 2017	4,806,982	US$	38.17	3.83	US$	109,017
Granted	1,320,672	US$	73.46
Exercised	(752,814)	US$	29.71
Forfeited	(55,850)	US$	35.72
Outstanding at December 31, 2018	5,318,990	US$	48.16	3.76	US$	90,526
Granted	1,169,728	US$	69.46
Exercised	(1,172,210)	US$	35.03
Forfeited	(53,557)	US$	62.65
Outstanding at December 31, 2019	5,262,951	US$	55.67	3.76	US$	153,857
Vested and expected to vest at December 31, 2019	5,008,721	US$	55.12	3.71	US$	149,166
Exercisable at December 31, 2019	2,626,300	US$	45.01	2.71	US$	104,764

Summary of non-vested share option activity

		Weighted
		average
		grant-date
	Number	fair value
	of shares	(per share)
Non-vested at December 31, 2016	2,495,346	US$	10.37
Granted	1,279,872	US$	15.62
Vested	(1,085,019)	US$	10.50
Forfeited	(119,902)	US$	10.55
Non-vested at December 31, 2017	2,570,297	US$	12.86
Granted	1,320,672	US$	21.53
Vested	(1,132,050)	US$	12.51
Forfeited	(55,850)	US$	10.83
Non-vested at December 31, 2018	2,703,069	US$	17.29
Granted	1,169,728	US$	22.12
Vested	(1,182,589)	US$	15.99
Forfeited	(53,557)	US$	18.16
Non-vested at December 31, 2019	2,636,651	US$	20.00
Expected to vest at December 31, 2019	2,382,421	US$	19.99