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DEBT - Interest Rates (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Sep. 21, 2005	Sep. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest rates on debt
Effective Interest Rate (as a percent)			5.29%	4.50%	3.65%
Letter of credit
Restricted cash, non-current			$ 23,233	$ 27,426	$ 315
Minimum
Interest rates on debt
Range of interest rates (excluding unused commitment fees)			3.36%	2.69%	2.69%
Maximum
Interest rates on debt
Range of interest rates (excluding unused commitment fees)			7.82%	7.12%	6.73%
Letter of credit
Letter of credit
Fee on letter of credit (as a percent)	1.00%	1.375%	1.375%	1.375%
Amount of letters outstanding			$ 300	$ 300
Restricted cash, non-current			$ 315	$ 315
Letter of credit | Minimum
Letter of credit
Notice period for cancellation of line of credit			30 days

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement, excluding unused commitment fees.

+ References

No definition available.

+ Details

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X

- Definition

Represents the notice period for cancellation of line of credit.

+ References

No definition available.

+ Details

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X

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- References

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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