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DEBT (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Nov. 04, 2015 USD ($)	Jul. 14, 2015 USD ($)	Apr. 07, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 03, 2013 USD ($)	Aug. 30, 2013 USD ($)	Aug. 20, 2010 USD ($)	Aug. 12, 2010 USD ($)
Line of Credit Facility
Principal amount	$ 569,980	$ 588,434
Less: Unamortized debt issuance costs	(8,883)	(9,411)
Current portion	$ (561,097)	(579,023)
Number of credit facilities | item	8
Previously reported | Deferred financing costs, net
Line of Credit Facility
Less: Unamortized debt issuance costs		(9,411)
Scenario Adjustment | Adoption Of ASU 2015-03 | Current portion of long-term debt
Line of Credit Facility
Less: Unamortized debt issuance costs	$ (8,883)	(9,411)
Secured Debt | $100 Million Term Loan Facility
Line of Credit Facility
Principal amount	58,177	60,100
Less: Unamortized debt issuance costs	(1,119)	(1,201)
Current portion	(57,058)
Maximum borrowing capacity	100,000	100,000								$ 100,000
Secured Debt | $253 Million Term Loan Facility
Line of Credit Facility
Principal amount	135,118	145,268
Less: Unamortized debt issuance costs	(2,356)	(2,528)
Current portion	(132,762)
Maximum borrowing capacity	253,000	253,000							$ 253,000
Secured Debt | $44 Million Term Loan Facility
Line of Credit Facility
Principal amount	37,813	38,500
Less: Unamortized debt issuance costs	(547)	(584)
Current portion	(37,266)
Maximum borrowing capacity	44,000	44,000					$ 44,000
Secured Debt | $22 Million Term Loan Facility
Line of Credit Facility
Principal amount	18,250	18,625
Less: Unamortized debt issuance costs	(350)	(376)
Current portion	(17,900)
Maximum borrowing capacity	22,000	22,000		$ 22,000				$ 22,000
Secured Debt | 2014 Term Loan Facilities
Line of Credit Facility
Principal amount	30,388	31,069
Less: Unamortized debt issuance costs	(1,668)	(1,715)
Revolving Credit Facility | 2015 Revolving Credit Facility
Line of Credit Facility
Principal amount	54,577	56,218
Current portion	(54,577)
Maximum borrowing capacity					$ 59,500
Line of Credit Facility | $98 Million Credit Facility
Line of Credit Facility
Principal amount	98,271	98,271
Less: Unamortized debt issuance costs	(2,244)	(2,368)
Current portion	(96,027)
Maximum borrowing capacity	98,000	98,000	$ 98,000
Line of Credit Facility | $148 Million Credit Facility
Line of Credit Facility
Principal amount	137,386	140,383
Less: Unamortized debt issuance costs	(599)	(639)
Current portion	(136,787)
Maximum borrowing capacity	$ 148,000	$ 148,000		$ 148,000		$ 148,000

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+ References

No definition available.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ 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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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

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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