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Employee Share Plans | 6 Months Ended
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Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Employee Share Plans | Note 10. Employee Share Plans Under our stock incentive plan, which expires in 2024, a maximum of 9.6 million stock options, shares of restricted stock or other stock-based compensation awards may be granted. Shares subject to award under this plan may be either authorized but unissued shares of CBIZ common stock or treasury shares. Compensation expense for stock-based awards recognized during the three and six months ended June 30, 2017 and 2016 was as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Stock options |  | $ | 524 |  |  | $ | 564 |  |  | $ | 1,050 |  |  | $ | 1,143 |
Restricted stock awards |  |  | 891 |  |  |  | 869 |  |  |  | 1,740 |  |  |  | 1,699 |
Total stock-based compensation expense |  | $ | 1,415 |  |  | $ | 1,433 |  |  | $ | 2,790 |  |  | $ | 2,842 |
Stock award activity during the six months ended June 30, 2017 was as follows (in thousands, except per share data):
|  | Stock Options |  |  | Restricted Stock 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 |  |  | 4,376 |  |  | $ | 8.02 |  |  |  | 827 |  |  | $ | 9.14 |
Granted |  |  | 654 |  |  | $ | 15.54 |  |  |  | 295 |  |  | $ | 14.90 |
Exercised or released |  |  | (805 | ) |  | $ | 7.02 |  |  |  | (393 | ) |  | $ | 8.61 |
Expired or canceled |  |  | (6 | ) |  | $ | 7.44 |  |  |  | (1 | ) |  | $ | 8.36 |
Outstanding at June 30, 2017 |  |  | 4,219 |  |  | $ | 9.38 |  |  |  | 727 |  |  | $ | 11.76 |
Exercisable at June 30, 2017 |  |  | 2,370 |  |  | $ | 7.61 |  |  |  |  |  |  |  |  |
| (1) | Represents weighted average market value of the shares; awards are granted at no cost to the recipients.
We utilized the Black-Scholes-Merton options-pricing model to determine the fair value of stock options on the date of grant. The fair value of stock options granted during the second quarter of 2017 was $3.49. The following weighted average assumptions were utilized:
|  | Six Months Ended June 30, |
Expected volatility (1) |  |  | 22.22 | %
Expected option life (years) (2) |  |  | 4.61 |
Risk-free interest rate (3) |  |  | 1.85 | %
Expected dividend yield (4) |  |  | 0.00 | %
| (1) | The expected volatility assumption was determined based upon the historical volatility of our stock price, using daily price intervals.
| (2) | The expected option life was determined based upon our historical data using a midpoint scenario, which assumes all options are exercised halfway between the expiration date and the weighted average time for 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 our historical and estimated dividend payouts. We do not expect to change our dividend payout policy in the foreseeable future.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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