Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Equity Awards and Instruments - Summary of the intrinsic value of options outstanding and exercisable (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Intrinsic value of options outstanding and exercisable
Total pre-tax expense	$ 23,617	$ 6,046
Stock Option
Intrinsic value of options outstanding and exercisable
Number of Options, Outstanding			18,691,667
Number of Options, Exercisable			7,573,830
Weighted Average Exercise Price, Outstanding			$ 5.97
Weighted Average Exercise Price, Exercisable			$ 5.05
Aggregate Intrinsic Value, Outstanding			$ 91,028
Aggregate Intrinsic Value, Exercisable			$ 43,852
Weighted Remaining Contractual Life (in years), Outstanding			2 years 7 months 6 days
Weighted Remaining Contractual Life (in years), Exercisable			1 year 7 months 6 days
Total pre-tax expense	5,849	4,795	$ 6,342	$ 4,808
Unrecognized compensation cost related to unvested stock options	$ 7,825		$ 11,911
Weighted average period related to unvested stock options (in years)	1 year 10 months 24 days		2 years 7 months 6 days
Total intrinsic value of stock options exercised	$ 58,502	21,555	$ 22,914	18,291
Restricted stock expense
Intrinsic value of options outstanding and exercisable
Total pre-tax expense	$ 2,104	$ 1,251	$ 1,749	$ 3,074