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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognized From Contracts With Customers (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 100,077	$ 78,504	$ 339,591	$ 300,533	$ 252,268
Revenue from other sources	529	3,455	6,001	17,217	7,867
Total revenues	100,606	81,959	345,592	317,750	260,135
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	97,343	76,648	332,939	297,077	$ 252,268
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,734	$ 1,856	$ 6,652	$ 3,456

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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