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GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Sep. 30, 2020 USD ($) D $ / shares	Sep. 30, 2020 USD ($) D $ / shares	Dec. 31, 2019 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) D $ / shares	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Changes in the carrying amount of goodwill
Balance, beginning of period		$ 28,388	$ 28,618	$ 28,618	$ 28,388	$ 11,942
Goodwill arising in business combination		24,138		0	24,138	16,676
Balance, end of period	$ 52,526	$ 52,526	$ 28,388	28,618	$ 52,526	28,618
Number of the last trading days of the period in measuring closing price | D	10	10			10
Average closing share price (in dollars per share) | $ / shares	$ 16.24	$ 15.96	$ 26.05
Share price (in dollars per share) | $ / shares	$ 18.65	$ 18.65			$ 18.65
Estimated Fair value of reporting unit	$ 352,700	$ 352,700			$ 352,700
Stockholders' equity	$ 296,316	$ 296,316	$ 244,452	$ 242,939	$ 296,316	$ 242,939	$ 255,791	$ 239,716	$ 197,368
Rate of Excess in Fair value of reporting unit over the Stockholders' equity	19.00%	19.00%			19.00%
Goodwill impairment					$ 0
Valuation: Income Approach
Changes in the carrying amount of goodwill
Weighting percentage					60.00%
Resulted fair value	$ 375,300	$ 375,300			$ 375,300
Estimated earnings period					5 years
Percentage of Operating Expenses Reduction	20.00%	20.00%			20.00%
Required percentage of Intangible assets to be maintained	9.00%	9.00%			9.00%
Valuation: Income Approach | Maximum
Changes in the carrying amount of goodwill
Resulted fair value	$ 410,700	$ 410,700			$ 410,700
Projected cash flows, Discount rate	14.00%	14.00%			14.00%
Projected cash flows, Capitalization rate	11.00%	11.00%			11.00%
Valuation: Income Approach | Minimum
Changes in the carrying amount of goodwill
Resulted fair value	$ 340,000	$ 340,000			$ 340,000
Projected cash flows, Discount rate	12.00%	12.00%			12.00%
Projected cash flows, Capitalization rate	9.00%	9.00%			9.00%
Valuation: Income Approach | Midpoint
Changes in the carrying amount of goodwill
Projected cash flows, Discount rate	13.00%	13.00%			13.00%
Projected cash flows, Capitalization rate	10.00%	10.00%			10.00%
Change of control premium to Corporation's September 30, 2020 Market price Approach
Changes in the carrying amount of goodwill
Weighting percentage					20.00%
Resulted fair value	$ 329,000	$ 329,000			$ 329,000
Change of control premium to Corporation's September 30, 2020 Market price Approach | Maximum
Changes in the carrying amount of goodwill
Resulted fair value	$ 335,500	$ 335,500			$ 335,500
Control premium percentage	30.00%	30.00%			30.00%
Change of control premium to Corporation's September 30, 2020 Market price Approach | Minimum
Changes in the carrying amount of goodwill
Resulted fair value	$ 322,600	$ 322,600			$ 322,600
Control premium percentage	25.00%	25.00%			25.00%
Change of control premium to the Corporation's Volume-weighted average market price Approach
Changes in the carrying amount of goodwill
Weighting percentage					20.00%
Resulted fair value	$ 319,200	$ 319,200			$ 319,200
Change of control premium to the Corporation's Volume-weighted average market price Approach | Maximum
Changes in the carrying amount of goodwill
Resulted fair value	$ 325,700	$ 325,700			$ 325,700
Control premium percentage	30.00%	30.00%			30.00%
Change of control premium to the Corporation's Volume-weighted average market price Approach | Minimum
Changes in the carrying amount of goodwill
Resulted fair value	$ 312,700	$ 312,700			$ 312,700
Control premium percentage	25.00%	25.00%			25.00%

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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.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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