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