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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The 2017 Stock Incentive Plan (the “Plan”) is designed to provide long-term equity-based compensation to our directors and employees. It is administered by the Compensation Committee of the Board of Directors. Awards under the Plan may be granted with respect to an aggregate of 12,750,000 shares of common stock and may be issued in the form of: (a) incentive stock options, (b) non-qualified stock options, (c) stock appreciation rights, (d) dividend equivalent rights, (e) restricted stock, (f) restricted stock units or (g) unrestricted stock. In addition, the Plan limits the total number of shares of common stock with respect to which awards may be granted to any employee or director during any one calendar year. At March 31, 2021, 11,617,723 shares of common stock remained available for issuance by us as equity awards under the Plan. The following table details the stock-based compensation expense recorded as General and administrative expense in the Statement of Operations:
| Three Months Ended March 31, |  |
(In thousands) | 2021 |  | 2020 |  |  |  |
Stock-based compensation expense | $ | 2,277 |  |  | $ | 1,350 |  |  |  |  |
The following table details the activity of our time-based restricted stock and performance-based restricted stock units:
| Three Months Ended March 31, 2021 |  | Three Months Ended March 31, 2020
(In thousands, except per share data) | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Outstanding at beginning of period | 855 |  |  | $ | 21.48 |  |  | 601 |  |  | $ | 21.16 |
Granted | 464 |  |  | 20.01 |  |  | 370 |  |  | 22.21 |
Vested | (317) |  |  | 19.83 |  |  | (80) |  |  | 20.80 |
Forfeited | (60) |  |  | 19.90 |  |  | (25) |  |  | 21.21 |
Canceled | — |  |  | — |  |  | — |  |  | — |
Outstanding at end of period | 942 |  |  | $ | 21.42 |  |  | 866 |  |  | $ | 21.64 |
As of March 31, 2021, there was $16.5 million of unrecognized compensation cost related to non-vested stock-based compensation arrangements under the Plan. This cost is expected to be recognized over a weighted average period of 2.2 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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- References No definition available. + Details
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