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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Advertising Costs |  |  |  |  |  |
Advertising expense |  |  | $ 70.4 | $ 67.0 | $ 71.4 |
Vendor consideration |  |  | $ 3.3 | $ 5.8 | $ 6.4 |
Net Income (Loss) Per Common Share |  |  |  |  |  |
Stock options and restricted stock awards securities excluded from computation of earnings (loss) per share (in shares) |  |  | 0 | 40 | 1,300 |
Employee Benefit Plans |  |  |  |  |  |
Minimum annual contribution per employee |  |  | 1.00% |  |  |
Aggregate expense in contribution plans |  |  | $ 1.2 | $ 0.7 | $ 0.4 |
Fair Value Measurements |  |  |  |  |  |
Weighted average interest rate on short-term borrowings | 5.70% | 4.70% | 5.70% | 4.70% | 4.70% |
ETG |  |  |  |  |  |
Evaluation of Long-lived Assets |  |  |  |  |  |
Impairment charge on long-lived assets |  | $ 1.7 |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |
Intangible asset impairment charges |  | 0.3 |  |  |  |
Advertising Costs |  |  |  |  |  |
Advertising expense |  |  | $ 1.1 | $ 2.2 | $ 3.6 |
Vendor consideration |  |  | 2.0 | 4.7 | 6.3 |
NATG |  |  |  |  |  |
Advertising Costs |  |  |  |  |  |
Advertising expense |  |  | $ 0.0 | $ 0.3 | 1.5 |
Vendor consideration |  |  |  |  | $ 0.9 |
IPG |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |
Intangible asset impairment charges | $ 1.9 | $ 0.1 |  |  |  |
Minimum |  |  |  |  |  |
Advertising Costs |  |  |  |  |  |
Amortization period |  |  | 1 month |  |  |
Maximum |  |  |  |  |  |
Advertising Costs |  |  |  |  |  |
Amortization period |  |  | 4 months |  |  |
Furniture, Fixtures and Equipment | Minimum |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |
Furniture, Fixtures and Equipment | Maximum |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Estimated useful lives |  |  | 10 years |  |  |
Internal-Use Software |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |
Employee Stock Option |  |  |  |  |  |
Net Income (Loss) Per Common Share |  |  |  |  |  |
Shares included in the calculated of diluted earnings per share |  |  | 500 | 400 | 0 |
Employee Stock Option | ETG |  |  |  |  |  |
Advertising Costs |  |  |  |  |  |
Additional compensation costs |  |  | $ 0.3 |  |  |
Restricted Stock |  |  |  |  |  |
Net Income (Loss) Per Common Share |  |  |  |  |  |
Shares included in the calculated of diluted earnings per share |  |  | 200 | 200 | 300 |
Subsequent Event | Pro Forma | Accounting Standards Update 2016-02 | Minimum |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Operating lease liability |  |  |  |  |  | $ 52.0
Right of use asset |  |  |  |  |  | 62.0
Subsequent Event | Pro Forma | Accounting Standards Update 2016-02 | Maximum |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |
Operating lease liability |  |  |  |  |  | 57.0
Right of use asset |  |  |  |  |  | $ 67.0

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