STOCK-BASED COMPENSATION - Exercise Prices (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Stock options outstanding and stock options exercisable
Stock options outstanding (in shares) | shares	22,643
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	5 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 23.55
Options Exercisable (in shares) | shares	12,231
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 11.26
Range of Exercise Prices $4.51 - $4.51
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	4.51
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 4.51
Stock options outstanding (in shares) | shares	52
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 10 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.51
Options Exercisable (in shares) | shares	52
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.51
Range of Exercise Prices $5.29 - $5.29
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	5.29
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 5.29
Stock options outstanding (in shares) | shares	3,945
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.29
Options Exercisable (in shares) | shares	3,945
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.29
Range of Exercise Prices $5.61 - $5.61
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	5.61
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 5.61
Stock options outstanding (in shares) | shares	55
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.61
Options Exercisable (in shares) | shares	55
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.61
Range of Exercise Prices $5.94 - $5.94
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	5.94
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 5.94
Stock options outstanding (in shares) | shares	3,427
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.94
Options Exercisable (in shares) | shares	3,427
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.94
Range of Exercise Prices $6.02 - $15.71
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	6.02
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 15.71
Stock options outstanding (in shares) | shares	2,286
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 12.57
Options Exercisable (in shares) | shares	1,440
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.73
Range of Exercise Prices $15.88 - $22.26
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	15.88
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 22.26
Stock options outstanding (in shares) | shares	2,268
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	6 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 18.60
Options Exercisable (in shares) | shares	1,666
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 18.43
Range of Exercise Prices $23.00 - $36.05
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	23.00
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 36.05
Stock options outstanding (in shares) | shares	2,289
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	7 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 23.83
Options Exercisable (in shares) | shares	1,075
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 23.45
Range of Exercise Prices $37.10 - $43.64
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	37.10
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 43.64
Stock options outstanding (in shares) | shares	2,218
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	9 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 41.64
Options Exercisable (in shares) | shares	162
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 37.42
Range of Exercise Prices $43.99 - $43.99
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	43.99
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 43.99
Stock options outstanding (in shares) | shares	2,774
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	9 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 43.99
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	0.00
Range of Exercise Prices $44.73 - $53.24
Stock options outstanding and stock options exercisable
Stock options, range of exercise prices, low end of range (in dollars per share)	44.73
Stock options, range of exercise prices, high end of range (in dollars per share)	$ 53.24
Stock options outstanding (in shares) | shares	3,329
Options Outstanding, Weighted Average Remaining Contractual Term (in years)	8 years 6 months
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 45.53
Options Exercisable (in shares) | shares	409
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 45.15