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Employee Stock Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Awards | Compensation expense for stock-based awards recognized during the three and nine months ended September 30, 2021 and 2020 was as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30, |
| 2021 |  | 2020 |  | 2021 |  | 2020 |
Stock options | $ | 581 |  |  | $ | 615 |  |  | $ | 1,114 |  |  | $ | 1,403 |  |
Restricted stock units and awards | 1,388 |  |  | 1,266 |  |  | 4,214 |  |  | 3,761 |  |
Performance share units | 936 |  |  | 604 |  |  | 3,031 |  |  | 1,601 |  |
Total stock-based compensation expense | $ | 2,905 |  |  | $ | 2,485 |  |  | $ | 8,359 |  |  | $ | 6,765 |  |
Schedule of Stock Options, Restricted Stock Units and Awards, and Performance Share Units Award Activity | The following table presents our stock options and restricted stock units and awards activity during the nine months ended September 30, 2021 (in thousands, except per share data):
| Stock Options |  | Restricted Stock Units and Awards |
| Number of Options |  | Weighted Average Exercise Price Per Share |  | Number of Shares |  | Weighted Average Grant-Date Fair Value (1) |
Outstanding at beginning of year | 1,820 |  |  | $ | 15.02 |  |  | 461 |  |  | $ | 21.03 |  |
Granted | 50 |  |  | $ | 32.64 |  |  | 174 |  |  | $ | 28.62 |  |
Exercised or released | (635) |  |  | $ | 11.25 |  |  | (246) |  |  | $ | 20.00 |  |
Expired or canceled | — |  |  | $ | — |  |  | — |  |  | $ | — |  |
Outstanding at September 30, 2021 | 1,235 |  |  | $ | 17.68 |  |  | 389 |  |  | $ | 25.07 |  |
Exercisable at September 30, 2021 | 1,087 |  |  | $ | 17.43 |  |  |  |  |  |
(1)Represents weighted average market value of the shares; awards are granted at no cost to the recipients. The following table presents our PSU award activity during the nine months ended September 30, 2021 (in thousands, except per share data):
| Performance Share Units |  | Weighted Average Grant-Date Fair Value Per Unit (1) |
Outstanding at beginning of year | 307 |  |  | $ | 22.18 |  |
Granted | 140 |  |  | $ | 27.56 |  |
Vested | — |  |  | $ | — |  |
Adjustments for performance results | — |  |  | $ | — |  |
Canceled | — |  |  | $ | — |  |
Outstanding at September 30, 2021 | 447 |  |  | $ | 23.86 |  |
(1)Represents weighted average market value of the performance share units; PSUs are granted at no cost to the recipients.
Schedule of Fair Value Option Award Weighted Average Assumptions Used | The following weighted average assumptions were utilized:
| Nine Months Ended September 30, 2021
Expected volatility (1) | 27.49%
Expected option life (years) (2) | 4.71
Risk-free interest rate (3) | 0.74%
Expected dividend yield (4) | —%
(1) The expected volatility assumption was determined based upon the historical volatility of CBIZ's stock price using daily price intervals. (2) The expected option life was determined based upon CBIZ's historical data using a midpoint scenario, which assumes all options are exercised halfway between the expiration date and the weighted average time it takes the option to vest. (3) The risk-free interest rate assumption was based upon zero-coupon U.S. treasury bonds with a term approximating the expected life of the respective options. (4) The expected dividend yield assumption was determined in view of CBIZ's historical and estimated dividend payouts. CBIZ does not expect to change its dividend payout policy in the foreseeable future.

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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