INCOME TAXES - Uncertain Tax Positions (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Unrecognized tax benefits [Abstract]
Unrecognized tax benefits, beginning of year	$ 22,372,000us-gaap_UnrecognizedTaxBenefits	$ 20,413,000us-gaap_UnrecognizedTaxBenefits
Gross increases - tax positions in prior period	1,025,000	2,003,000
Gross decreases - tax positions in prior period	(1,808,000)	(5,000)
Gross increases - current period tax positions	778,000	718,000
Lapse in statute of limitations	(453,000)	(757,000)
Unrecognized tax benefits, end of year	21,914,000us-gaap_UnrecognizedTaxBenefits	22,372,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact income tax expense	5,000,000	5,600,000
Accrued interest and penalties	100,000
Income taxes payable noncurrent	1,100,000us-gaap_AccruedIncomeTaxesNoncurrent
Minimum [Member]
Unrecognized tax benefits [Abstract]
Reserves reversed related to uncertain tax positions	0
Maximum [Member]
Unrecognized tax benefits [Abstract]
Reserves reversed related to uncertain tax positions	$ 1,600,000

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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 210.5-02.24)

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 24

-Article 5

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-Number 210

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Subparagraph b(1)

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- Definition

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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-Publisher FASB

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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