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BUSINESS ACQUISITIONS (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 16, 2016 | May 31, 2016 | Jun. 30, 2014 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial cash consideration to acquire business |  |  | $ 600,000 |  |  |  |  |  |  |  |  | $ 81,182,000 | $ 0 | $ 0
Contingent consideration range, minimum |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration range, maximum |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price consideration on acquisition date |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration on acquisition date |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 56,457,000 |  |  |  | $ 3,632,000 |  |  |  | 56,457,000 | 3,632,000 |
Revenue |  |  |  | 100,841,000 | $ 94,558,000 | $ 94,290,000 | $ 94,713,000 | 78,341,000 | $ 69,804,000 | $ 55,136,000 | $ 50,935,000 | 384,402,000 | 254,216,000 | 167,350,000
Operating income (loss) |  |  |  | 13,402,000 | $ 14,150,000 | $ 12,715,000 | $ 11,845,000 | $ 8,248,000 | $ 7,773,000 | $ 6,775,000 | $ 5,718,000 | $ 52,112,000 | 28,514,000 | $ (969,000)
Weighted Average Amortization Life |  |  | 10 years |  |  |  |  |  |  |  |  | 3 years 2 months 10 days |  |
Reduction in contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |
Iron Horse Holdings, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial cash consideration to acquire business | $ 80,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration range, maximum | 45,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price consideration on acquisition date | 103,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration on acquisition date | 23,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 52,450,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 9,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs | 400,000 |  |  |  |  |  |  |  |  |  |  |  | $ 5,500,000 |
SimpleTuition [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial cash consideration to acquire business |  | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price consideration on acquisition date |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration on acquisition date |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 375,000 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Amortization Life |  | 9 years 2 months |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration on acquisition date |  |  |  | 0 |  |  |  |  |  |  |  | $ 0 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration on acquisition date |  |  |  | $ 45,000,000 |  |  |  |  |  |  |  | $ 45,000,000 |  |
Earnout Payment for One Contingent Earnout [Member] | Iron Horse Holdings, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration range, minimum | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration range, maximum | $ 22,500,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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