STOCK-BASED COMPENSATION - Compensation Awards and Valuation Assumptions (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock options
Number of outstanding options
Balance at the beginning of the period (in shares)	4,262
Granted (in shares)	0	0
Exercised (in shares)	(19)
Forfeited (in shares)	(1,343)
Balance at the end of the period (in shares)	2,900	4,262
Weighted-Average Exercise Price of Outstanding Options
Balance at the beginning of the period (in dollars per share)	$ 23.00
Granted (in dollars per share)	0.00
Exercised (in dollars per share)	9.09
Forfeited (in dollars per share)	21.65
Balance at the end of the period (in dollars per share)	$ 23.72	$ 23.00
Additional disclosures
Aggregate intrinsic value of options outstanding	$ 100,000
Aggregate intrinsic value of options exercisable	100,000
Total intrinsic value of options exercised	38,000	$ 500,000	$ 17,500,000
Total estimated fair value of options vested	$ 4,700,000	$ 10,000,000	$ 5,700,000
Valuation Assumptions
Weighted-average estimated fair value of shares granted (in dollars per share)			$ 15.63
Stock options | Minimum
Valuation Assumptions
Risk-free interest rate (as a percent)			1.60%
Expected term (in years)			5 years
Volatility (as a percent)			52.00%
Dividend yield (as a percent)			3.00%
Stock options | Maximum
Valuation Assumptions
Risk-free interest rate (as a percent)			2.10%
Expected term (in years)			6 years
Volatility (as a percent)			60.00%
Dividend yield (as a percent)			4.00%
RSUs and PSUs
Number of outstanding RSUs and PSUs/RSAs and PSAs
Balance at the beginning of the period (in shares)	459
Granted (in shares)	237
Released RSUs and RSAs (in shares)	(269)
Forfeited (in shares)	(14)
Balance at the end of the period (in shares)	413	459
Weighted-Average Fair Value per Share at Grant
Balance at the beginning of the period (in dollars per share)	$ 18.34
Granted (in dollars per share)	11.32
Released RSUs and RSAs (in dollars per share)	16.93
Forfeited (in dollars per share)	16.75
Balance at the end of the period (in dollars per share)	$ 15.29	$ 18.34
RSAs and PSAs
Number of outstanding RSUs and PSUs/RSAs and PSAs
Balance at the beginning of the period (in shares)	1,305
Granted (in shares)	645
Released RSUs and RSAs (in shares)	(809)
Forfeited (in shares)	(16)
Balance at the end of the period (in shares)	1,125	1,305
Weighted-Average Fair Value per Share at Grant
Balance at the beginning of the period (in dollars per share)	$ 18.00
Granted (in dollars per share)	10.36
Released RSUs and RSAs (in dollars per share)	17.86
Forfeited (in dollars per share)	21.61
Balance at the end of the period (in dollars per share)	$ 13.67	$ 18.00
Employee Stock Purchase Plan
Valuation Assumptions
Dividend yield (as a percent)	0.00%		8.00%
Weighted-average estimated fair value of shares granted (in dollars per share)	$ 4.47	$ 4.52	$ 4.49
Employee Stock Purchase Plan | Minimum
Valuation Assumptions
Risk-free interest rate (as a percent)	0.40%	0.10%	0.10%
Expected term (in years)	6 months	6 months	6 months
Volatility (as a percent)	39.00%	44.00%	43.00%
Dividend yield (as a percent)		0.00%
Employee Stock Purchase Plan | Maximum
Valuation Assumptions
Risk-free interest rate (as a percent)	1.00%	0.90%	0.50%
Expected term (in years)	2 years	2 years	2 years
Volatility (as a percent)	66.00%	69.00%	55.00%
Dividend yield (as a percent)		6.00%