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DEBT (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Nov. 04, 2015	Sep. 30, 2015	Jul. 14, 2015	Apr. 07, 2015	Dec. 31, 2014	Dec. 03, 2013	Aug. 30, 2013	Aug. 20, 2010	Aug. 12, 2010
Line of Credit Facility
Principal amount	$ 548,276	$ 588,434
Less: Unamortized debt issuance costs	(7,821)	(9,411)
Current portion	(540,455)	(579,023)
Long-term debt, noncurrent	0	0
Scenario Adjustment | Adoption Of ASU 2015-03
Line of Credit Facility
Current portion		9,411
Deferred financing costs, net		9,411
Secured Debt | $100 Million Term Loan Facility
Line of Credit Facility
Principal amount	54,330	60,100
Less: Unamortized debt issuance costs	(955)	(1,201)
Current portion	(53,375)
Maximum borrowing capacity	100,000			$ 100,000							$ 100,000
Secured Debt | $253 Million Term Loan Facility
Line of Credit Facility
Principal amount	130,043	145,268
Less: Unamortized debt issuance costs	(2,010)	(2,528)
Current portion	(128,033)
Maximum borrowing capacity	253,000	253,000		253,000						$ 253,000
Secured Debt | $44 Million Term Loan Facility
Line of Credit Facility
Principal amount	36,438	38,500
Less: Unamortized debt issuance costs	(473)	(584)
Current portion	(35,965)
Maximum borrowing capacity	44,000	44,000		44,000				$ 44,000
Secured Debt | $22 Million Term Loan Facility
Line of Credit Facility
Principal amount	17,500	18,625
Less: Unamortized debt issuance costs	(299)	(376)
Current portion	(17,201)
Maximum borrowing capacity	22,000	22,000		22,000	$ 22,000				$ 22,000
Secured Debt | 2014 Term Loan Facilities
Line of Credit Facility
Principal amount	29,006	31,069
Less: Unamortized debt issuance costs	(1,571)	(1,715)
Revolving Credit Facility | 2015 Revolving Credit Facility
Line of Credit Facility
Principal amount	51,294	56,218
Current portion	(51,294)
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	(1,994)	(2,368)
Current portion	(96,277)
Maximum borrowing capacity	98,000	98,000	$ 98,000
Line of Credit Facility | $148 Million Credit Facility
Line of Credit Facility
Principal amount	131,394	140,383
Less: Unamortized debt issuance costs	(519)	(639)
Current portion	(130,875)
Maximum borrowing capacity	$ 148,000	$ 148,000		$ 148,000	$ 148,000		$ 148,000

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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
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-Paragraph 20
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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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 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

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No definition available.

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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.

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

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