SIGNIFICANT ACCOUNTING POLICIES - Financial Instruments (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
FAIR VALUE MEASUREMENTS
Outstanding amount of debt	$ 530,292	$ 488,485
New credit agreement \| Term Loan
FAIR VALUE MEASUREMENTS
Outstanding amount of debt	213,750	222,188
New credit agreement \| Revolving Credit Facility
FAIR VALUE MEASUREMENTS
Outstanding amount of debt	70,000	25,000
Senior Notes due 2018
FAIR VALUE MEASUREMENTS
Outstanding amount of debt	200,000	200,000
Sellers notes
FAIR VALUE MEASUREMENTS
Outstanding amount of debt	$ 26,624	21,072
Recurring basis \| Level 1 \| Money market funds
FAIR VALUE MEASUREMENTS
Market price (in dollars per share)	$ 1
Recurring basis \| Level 1 \| Money market funds \| Cash and cash equivalents
FAIR VALUE MEASUREMENTS
Fair value of assets	$ 12,000	4,000
Recurring basis \| Level 1 \| Money market funds \| Other current assets
FAIR VALUE MEASUREMENTS
Fair value of assets	3,800	3,700
Recurring basis \| Level 2 \| New credit agreement \| Term Loan
FAIR VALUE MEASUREMENTS
Fair value of the debt	211,700	223,100
Recurring basis \| Level 2 \| New credit agreement \| Revolving Credit Facility
FAIR VALUE MEASUREMENTS
Fair value of the debt	69,200	25,100
Recurring basis \| Level 2 \| Senior Notes due 2018
FAIR VALUE MEASUREMENTS
Fair value of the debt	$ 203,000	$ 213,300

Represents the market price equivalent the Company uses for valuation of the money market investments.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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+ 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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

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+ References

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