INCOME (LOSS) PER SHARE - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		2 Months Ended	3 Months Ended																10 Months Ended	12 Months Ended
		Dec. 31, 2016	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Oct. 31, 2016	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Earnings Per Share, Diluted			$ 0.08	[1]	$ 0.08	[1],[2]	$ (0.17)	[1],[2]	$ (0.01)	[1]	$ 0.08	[1]	$ 0.00	[1]	$ (0.02)	[1]	$ (0.04)	[1]		$ (0.02)	$ 0.02
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share			$ 0.00	[1]	$ 0.00	[1],[2]	$ 0.00	[1],[2]	$ 0.00	[1]	$ 0.00	[1]	$ 0.00	[1]	$ (0.01)	[1]	$ 0.00	[1]		$ 0.00	$ (0.01)
Numerator
Income (loss) from continuing operations			$ 49,862		$ 47,175		$ (92,254)		$ (2,795)		$ 51,071		$ 3,802		$ (5,403)		$ (20,869)			$ 1,988	$ 28,601		$ (166,209)
Less: Net income (loss) attributable to noncontrolling interests																				13,067	12,587		11,264
Income (loss) from discontinued operations, net of tax			0	[3]	0	[2],[3]	0	[2],[3]	0	[3]	(223)	[3]	(862)	[3]	(1,376)	[3]	487	[3]		0	(1,974)	[4],[5]	(17,114)	[4]
Net income (loss) attributable to common stockholders			$ 46,228		$ 44,615	[2]	$ (95,034)	[2]	$ (6,888)		$ 47,721		$ 59		$ (9,326)		$ (24,414)			$ (11,079)	$ 14,040		$ (194,587)
Denominator
Weighted-average common shares outstanding (in shares)																				566,511,108	559,367,075
Weighted Average Number of Shares Outstanding, Diluted																				566,511,108	568,418,371		576,354,258	[6]
Basic net income (loss) per share (in usd per share)			$ 0.08	[1]	$ 0.08	[1],[2]	$ (0.17)	[1],[2]	$ (0.01)	[1]	$ 0.09	[1]	$ 0.00	[1]	$ (0.02)	[1]	$ (0.04)	[1]		$ (0.02)	$ 0.03		$ (0.34)	[6],[7]
Income (Loss) from Continuing Operations, Per Basic Share			0.08	[1]	0.08	[1],[2]	(0.17)	[1],[2]	(0.01)	[1]	0.09	[1]	0.00	[1]	(0.01)	[1]	(0.04)	[1]		(0.02)	0.03		(0.31)	[6],[7]
Discontinued operations (in usd per share)			0.00	[1]	0.00	[1],[2]	0.00	[1],[2]	0.00	[1]	0.00	[1]	0.00	[1]	(0.01)	[1]	0.00	[1]		0.00	0.00		$ (0.03)	[6],[7]
Income (Loss) from Continuing Operations, Per Diluted Share			$ 0.08	[1]	$ 0.08	[1],[2]	$ (0.17)	[1],[2]	$ (0.01)	[1]	$ 0.08	[1]	$ 0.00	[1]	$ (0.01)	[1]	$ (0.04)	[1]		$ (0.02)	$ 0.03
Common Class A [Member]
Numerator
Income (loss) from continuing operations																			$ (151,284)	$ 1,988	$ 28,601
Less: Net income (loss) attributable to noncontrolling interests																			9,559	13,067	12,587
Net income (loss) attributable to common stockholders - continuing operations																			(160,843)	(11,079)	16,014
Income (loss) from discontinued operations, net of tax																			(7,152)	0	(1,974)
Net income (loss) attributable to common stockholders																			$ (167,995)	$ (11,079)	$ 14,040
Denominator
Weighted-average common shares outstanding (in shares)																			574,755,214
Basic and diluted net income (loss) per share (1):
Continuing operations (in usd per share)	[7]																		$ (0.28)
Basic and diluted net income (loss) per share (in usd per share)	[7]																		$ (0.29)
Employee Stock Option
Denominator
Weighted Average Number Diluted Shares Outstanding Adjustment																				0	842,047
Restricted Stock [Member]
Denominator
Weighted Average Number Diluted Shares Outstanding Adjustment																				0	488,773
Restricted Stock Units (RSUs)
Denominator
Weighted Average Number Diluted Shares Outstanding Adjustment																				0	7,153,674
Employee Stock [Member]
Denominator
Weighted Average Number Diluted Shares Outstanding Adjustment																				0	201,504
Performance Shares
Denominator
Weighted Average Number Diluted Shares Outstanding Adjustment																				0	365,298
Common Stock
Numerator
Income (loss) from continuing operations		$ (14,293)																					$ (166,209)	[6]
Less: Net income (loss) attributable to noncontrolling interests		1,665																					11,264	[6]
Net income (loss) attributable to common stockholders - continuing operations		(15,958)																					(177,473)	[6]
Income (loss) from discontinued operations, net of tax		(9,932)																					(17,114)	[6]
Net income (loss) attributable to common stockholders		$ (25,890)																					(194,587)	[6]
Denominator
Weighted-average common shares outstanding (in shares)		574,884,987
Basic and diluted net income (loss) per share (1):
Continuing operations (in usd per share)	[7]	$ (0.03)
Basic and diluted net income (loss) per share (in usd per share)	[7]	$ (0.05)
Continuing Operations
Numerator
Income (loss) from continuing operations																				$ 1,988	$ 28,601		$ (166,209)

[1] The sum of per share amounts for quarterly periods may not equal year-to-date amounts due to rounding.

[2] Income (loss) from continuing operations includes a $40.4 million benefit and $75.0 million charge for the three months ended September 30, 2018 and June 30, 2018, related to our patent litigation with IBM. See Note10, Commitments and Contingencies, for additional information.

[3] Income (loss) from continuing operations includes restructuring charges of $11.5 million, $4.6 million and $2.7 million for the three months ended September 30, 2017, June 30, 2017 and March 31, 2017. Restructuring charges were not material for any quarterly period during the year ended December 31, 2018 or for the three months ended December 31, 2017.

[4] (1)The loss from discontinued operations before gain (loss) on dispositions and provision for income taxes for the years ended December 31, 2017 and 2016 includes the results of each business through its respective disposition date.

[5] (2)Selling, general and administrative expense from discontinued operations for the year ended December 31, 2017 includes increases to contingent liabilities under indemnification agreements. See Note 10, Commitments and Contingencies, for additional information about the indemnification liabilities.

[6] The potentially dilutive impacts of a conversion of Class B to Class A shares, outstanding equity awards, warrants and convertible senior notes have been excluded from the calculation of dilutive net income (loss) per share for the years ended December 31, 2016 as their effect on net income (loss) per share from continuing operations was antidilutive.

[7] The shares of Class A and Class B common stock had equal dividend rights and converted into shares of common stock on a one-for-one basis on October 31, 2016. This full year column reflects the weighted average Class A and Class B common shares outstanding for the period from January 1, 2016 through the October 31, 2016 conversion date and the weighted average common shares outstanding for the period from November 1, 2016 through December 31, 2016 in the denominator of the basic and diluted loss per share calculations for the year ended December 31, 2016.