COMMITMENTS, CONTINGENCIES AND LITIGATION - Narrative (Details) - USD ($)			3 Months Ended		12 Months Ended
	Apr. 06, 2017	Feb. 28, 2017	Mar. 31, 2017	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 26, 2017	Dec. 31, 2013
Commitment Contingencies and Litigation [Line Items]
Credit limit									$ 350,000,000.0
Loss on extinguishment and modification of debt					$ 6,785,000	$ 0	$ 0
Asset retirement obligation					1,900,000	2,800,000
Rent expense					$ 15,600,000	21,800,000	$ 21,600,000
Revolving credit facility
Commitment Contingencies and Litigation [Line Items]
Credit limit									50,000,000.0
Increased applicable margin for credit agreement percentage				1.00%
Fee amount				$ 1,700,000
Revolving credit facility | Base rate
Commitment Contingencies and Litigation [Line Items]
Interest rate during period for the credit agreement					4.50%
Revolving credit facility | LIBOR
Commitment Contingencies and Litigation [Line Items]
Interest rate during period for the credit agreement					5.50%
Term Loan
Commitment Contingencies and Litigation [Line Items]
Credit limit									$ 300,000,000.0
Debt balance					$ 298,500,000
Repayment of loan					750,000
Term loan, unamortized discount and prepaid costs					$ 9,800,000	$ 6,800,000
Term Loan | Base rate
Commitment Contingencies and Litigation [Line Items]
Interest rate during period for the credit agreement					5.00%
Term Loan | LIBOR
Commitment Contingencies and Litigation [Line Items]
Interest rate during period for the credit agreement					6.00%
Other Current Liabilities
Commitment Contingencies and Litigation [Line Items]
Asset retirement obligation					$ 200,000
Other Noncurrent Liabilities
Commitment Contingencies and Litigation [Line Items]
Asset retirement obligation					$ 1,700,000
Minimum
Commitment Contingencies and Litigation [Line Items]
Initial lease terms					3 years
Maximum
Commitment Contingencies and Litigation [Line Items]
Initial lease terms					25 years
Credit Agreement 2017 | Revolving credit facility
Commitment Contingencies and Litigation [Line Items]
Credit limit	$ 25,000,000
Debt issuance costs	400,000
Debt balance					$ 5,000,000
Interest rate during period for the term loan and revolver					10.30%
Credit Agreement 2017 | Term Loan
Commitment Contingencies and Litigation [Line Items]
Credit limit	300,000,000
Debt issuance costs	3,300,000
Debt balance					$ 298,500,000
Interest rate during period for the term loan and revolver					8.40%
Credit Agreement
Commitment Contingencies and Litigation [Line Items]
Loss on extinguishment and modification of debt	4,800,000
Minimum gross cash proceeds from equity offering (not less than)		$ 40,000,000
Minimum net cash proceeds from equity offering (not less than)		37,000,000
Credit Agreement | LIBOR
Commitment Contingencies and Litigation [Line Items]
Basis spread on variable rate					1.00%
Credit Agreement | Prime Rate
Commitment Contingencies and Litigation [Line Items]
Basis spread on variable rate					2.00%
Credit Agreement | Federal Funds Effective Rate
Commitment Contingencies and Litigation [Line Items]
Basis spread on variable rate					0.50%
Credit Agreement | Revolving credit facility
Commitment Contingencies and Litigation [Line Items]
Debt issuance costs paid			$ 400,000
Fee amount		$ 1,600,000						$ 900,000
Prepaid debt issuance cost			100,000
Credit Agreement | Term Loan
Commitment Contingencies and Litigation [Line Items]
Fee amount			2,600,000
Term loan, unamortized discount and prepaid costs			2,200,000
Third party fees			300,000
Interest expense, debt			$ 300,000
Line of Credit | Credit Agreement 2017
Commitment Contingencies and Litigation [Line Items]
Debt issuance costs paid	5,700,000
Line of Credit | Credit Agreement 2017 | Term Loan
Commitment Contingencies and Litigation [Line Items]
Loss on extinguishment and modification of debt	$ 1,900,000