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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, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest rates on debt
Effective Interest Rate (as a percent)			5.31%	5.71%	5.29%
Letter of credit
Restricted cash, non-current			$ 315	$ 315	$ 23,233	$ 27,426
Minimum
Interest rates on debt
Range of interest rates (excluding unused commitment fees)			4.05%	3.83%	3.36%
Maximum
Interest rates on debt
Range of interest rates (excluding unused commitment fees)			5.76%	8.43%	7.82%
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

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- Definition

Represents the notice period for cancellation of line of credit.

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- Definition

The average effective interest rate during the reporting period.

+ References

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- Definition

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

+ References

No definition available.

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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.

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- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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