DEBT (Details)	12 Months Ended
Dec. 31, 2017 USD ($) extension	Oct. 31, 2012 USD ($)
Revolving Credit Agreement
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 175,000,000.0
Number of anniversaries for optional annual extensions of the credit agreement \| extension	3
Period of extension	1 year
Amount outstanding	$ 0
Number of options available for calculating variable interest rate \| extension	2
Letter of credit subfacility
Short-term Debt [Line Items]
Maximum borrowing capacity		75,000,000.0
Letter of credit amount maintained	$ 29,400,000
Swingline subfacility
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 25,000,000.0
Amount outstanding	$ 0
Federal Funds rate
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	0.50%
Adjusted LIBOR rate
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	1.00%
Eurodollar borrowings, Adjusted LIBOR
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	0.75%
Minimum \| Eurodollar borrowings, Adjusted LIBOR
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	0.75%
Maximum \| Eurodollar borrowings, Adjusted LIBOR
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	1.00%

Debt Instrument, Calculation of Variable Interest Rate Options Number

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- Definition

Debt Instrument Extension Period

+ References

No definition available.

+ Details

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- Definition

Debt Instrument Optional Annual Extensions on Number of Anniversaries

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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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.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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