Stockholders Equity - RSU activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Weighted-average grant date fair value (per share)
Stock-based compensation	$ 900	$ 700
Non-cash compensation expense not yet charged to net income	$ 18,100	$ 2,700
RSUs and RSAs
Number of shares
Outstanding, Beginning balance	1,009,617
Granted (in shares)	208,514
Vested (in shares)	(60,370)
Outstanding, Ending balance	1,157,761
Grant date fair value
Beginning balance	$ 15,722
Granted	3,298
Vested	(894)
Ending balance	$ 18,126
Weighted-average grant date fair value (per share)
Beginning balance	$ 15.57
Granted (in per share)	15.82
Vested (in per share)	14.81
Ending balance	$ 15.66

Amount of non-cash compensation expense related to unvested awards had not yet been charged to net income.

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The weighted average fair value amount at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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No definition available.

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The weighted average fair value amount of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The weighted average fair value amount as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The aggregate amount of share-based compensation in noncash financing activities.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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