STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation cost charged against income
Operating expenses			$ 45,848	$ 32,719	$ 28,552
Total employee and non-employee share-based compensation expense included in income, before income tax			45,848	32,719	28,552
Less: Amount of income tax benefit recognized in earnings			(34,909)	(9,058)	(2,932)
Amount charged against net income			10,939	23,661	25,620
Operating expense
Compensation cost charged against income
Total employee and non-employee share-based compensation expense included in income, before income tax			$ 45,800	$ 32,700	$ 28,600
Stock options
Stock-based compensation
Weighted-average grant-date fair value of options granted (in dollars per share)			$ 16.90	$ 16.73	$ 10.50
Total intrinsic value of options exercised			$ 70,600	$ 870,100	$ 47,100
Cash received from option exercises			16,400	$ 49,200	$ 17,200
Total unrecognized compensation expense related to non-vested shares granted to employees			$ 99,600
Cost expected to be recognized over a weighted-average period			3 years 1 month 6 days
Stock units expected to vest (in shares)			21,269
Restricted stock units
Stock-based compensation
Total unrecognized compensation expense related to non-vested shares granted to employees			$ 13,900
Cost expected to be recognized over a weighted-average period			1 year 7 months 6 days
Stock units expected to vest (in shares)			500
Number of Shares
Non-vested at the beginning of the period (in shares)		535	535
Granted (in shares)	36	246
Vested (in shares)			(256)
Forfeited/cancelled (in shares)			(5)
Non-vested at the end of the period (in shares)			556	535
Weighted Average Grant-Date Fair Value
Non-vested at the beginning of the period (in dollars per share)		$ 33.19	$ 33.19
Granted (in dollars per share)	$ 49.65	$ 43.99	44.71	$ 45.50	$ 28.13
Vested (in dollars per share)			31.50
Forfeited/cancelled (in dollars per share)			19.42
Non-vested at the end of the period (in dollars per share)			$ 39.95	$ 33.19
Incentive stock option
Compensation cost charged against income
Total employee and non-employee share-based compensation expense included in income, before income tax			$ 8,000	$ 6,200	$ 4,800
Non-Qualified stock option
Compensation cost charged against income
Total employee and non-employee share-based compensation expense included in income, before income tax			$ 37,800	$ 26,500	$ 23,800