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Capital Stock and Equity Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumptions Used in Calculation of Fair Value | The following table sets forth the assumptions used in the Monte Carlo calculation for each material award granted in 2021 and 2020:
| February 10, 2021 |  | February 12, 2020
Expected volatility | 51.0% |  | 41.0%
Expected term (in years) | 2.9 |  | 2.9
Risk-free interest rate | 0.18% |  | 1.41%
Performance-Based Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | A summary of activity of the outstanding performance-based restricted stock units for the six months ended June 30, 2021 is presented below:
| Performance-Based Restricted Stock Units
Awards outstanding as of December 31, 2020 | 111,059 |
Awards granted | 39,955 |
Stock issued | — |
Awards cancelled | (34,020) |
Awards outstanding as of June 30, 2021 | 116,994 |
Time-Based Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | A summary of activity of the outstanding time-based restricted stock units for the six months ended June 30, 2021 is presented below:
| Time-Based Restricted Stock Units
Awards outstanding as of December 31, 2020 | 102,142 |
Awards granted | 46,998 |
Stock issued | (44,037) |
Awards cancelled | (5,450) |
Awards outstanding as of June 30, 2021 | 99,653 |
Deferred Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activities | A summary of activity of the outstanding deferred stock units for the six months ended June 30, 2021 is presented below:
| Deferred Stock Units
Awards outstanding as of December 31, 2020 | 12,450 |
Awards granted | 6,450 |
Stock issued | (9,400) |
Awards outstanding as of June 30, 2021 | 9,500 |
We recognized $1.2 million of compensation expense related to deferred stock units for the three and six months ended June 30, 2021, and $1.0 million of compensation expense for the three and six months ended June 30, 2020.

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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