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401(K) RETIREMENT SAVINGS PLAN (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
401(K) RETIREMENT SAVINGS PLAN
Employee's elective deferrals (as a percent)	100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Matching contributions by employer (as a percent)	4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Employer matching contributions to the Retirement Savings Plan	$ 1.5us-gaap_DefinedContributionPlanCostRecognized	$ 1.7us-gaap_DefinedContributionPlanCostRecognized	$ 1.6us-gaap_DefinedContributionPlanCostRecognized

X

- Details

Name:	us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration