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Stock-based Compensation and Other Employee Benefit Plans | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan | Stock-Based Compensation and Other Employee Benefit Plans Effective June 3, 2010, the stockholders of the Company approved the adoption of the On Assignment, Inc. 2010 Incentive Award Plan, (the “2010 Plan”). This plan permits the grant of stock options, including incentive stock options, nonqualified stock options, restricted stock awards, dividend equivalent rights, stock payments, deferred stock, restricted stock units (“RSUs”), performance shares and other incentive awards, stock appreciation rights and cash awards to its employees, directors and consultants. As of December 31, 2017, there were 2,130,289 shares available for issuance under the 2010 Plan. Effective May 15, 2012, the Board of Directors adopted the 2012 Employment Inducement Incentive Award Plan, (the “2012 Plan”). This plan allows for grants of stock to employees as employment inducement awards pursuant to New York Stock Exchange rules. The terms of the 2012 Plan are similar to the 2010 Plan. As of December 31, 2017, there were 191,392 shares available for issuance under the 2012 Plan. The Company believes that stock-based compensation aligns the interests of its employees and directors with those of its stockholders. Stock-based compensation provides incentives to retain and motivate executive officers and key employees responsible for driving Company performance and maintaining important relationships that contribute to the growth of the Company. Stock-based compensation expense was $24.0 million, $27.0 million and $22.0 million for the years ended December 31, 2017, 2016 and 2015, respectively, and is included in SG&A expenses. Effective January 1, 2017, the Company adopted ASU No. 2016-09, Compensation - Stock Compensation (Topic 718). Under this standard, excess tax benefits and deficiencies related to stock-based compensation are recognized as income tax benefit or expense in the consolidated statement of operations and comprehensive income, rather than in paid-in capital. This change in accounting for excess tax benefits and deficiencies was applied prospectively. The Company recognized $4.5 million of excess tax benefits in its 2017 consolidated statement of operations and comprehensive income. The Company recognized $2.7 million and $6.6 million of excess tax benefits in its consolidated statements of stockholders' equity for 2016 and 2015, respectively. Restricted Stock Units The fair value of each RSU is based on the fair market value of the awards on the grant date and the Company records compensation expense based on this value, net of a forfeiture rate. The forfeiture rate estimates the number of awards that will eventually vest and is based on historical vesting patterns for RSUs. A summary of the status of the Company’s unvested RSUs as of December 31, 2017 and changes during the year then ended are presented below:
|  | Service Conditions |  | Performance and Service Conditions |  | Total |  | Weighted Average Grant-Date Fair Value Per Unit
Unvested RSUs outstanding at December 31, 2016 |  | 279,262 |  |  | 916,593 |  |  | 1,195,855 |  |  |  | $ | 38.78 |  |
Granted |  | 120,914 |  |  | 320,406 |  |  | 441,320 |  |  |  | $ | 49.62 |  |
Vested |  | (179,223 | ) |  | (525,517 | ) |  | (704,740 | ) |  |  | $ | 38.84 |  |
Forfeited |  | (13,182 | ) |  | (59,280 | ) |  | (72,462 | ) |  |  | $ | 40.82 |  |
Unvested RSUs outstanding at December 31, 2017 |  | 207,771 |  |  | 652,202 |  |  | 859,973 |  |  |  | $ | 44.29 |  |
Unvested and expected to vest RSUs outstanding at December 31, 2017 |  | 191,205 |  |  | 615,460 |  |  | 806,665 |  |  |  | $ | 44.15 |  |
The total number of shares vested in the table above includes 291,368 shares surrendered by the employees to the Company for payment of income taxes. The surrendered shares are available for issuance under the 2010 Plan. In December 2017, the Company converted certain RSUs for 11 executive officers to Restricted Stock Awards ("RSAs") and accelerated the vesting of these RSAs and certain other RSUs. The original vesting dates for these awards were in early January 2018. The awards were accelerated as a tax planning strategy and there was no incremental stock-based compensation expense as a result of this acceleration. The weighted-average grant-date fair value of RSUs granted during 2017, 2016 and 2015 was $49.62, $36.07 and $40.49 per award, respectively. The fair value of RSUs that vested during 2017, 2016 and 2015, was $37.8 million, $21.7 million and $24.3 million, respectively. As of December 31, 2017, there was unrecognized compensation expense of $21.5 million related to unvested RSUs based on awards that are expected to vest. The unrecognized compensation expense is expected to be recognized over a weighted-average period of two years. Liability Awards The Company's outstanding liability awards have a performance component and vest in one year from the date of grant. The performance goals are approved by the Compensation Committee of the Company’s Board of Directors. The Company classifies these awards as liabilities until the number of shares is determined, in accordance with the grant. The number of shares is determined by dividing the final award liability balance by the Company’s closing stock price on the settlement dates. This liability is included in other accrued expenses in the accompanying consolidated balance sheets. The following table summarizes the balance of liability awards and expense during the years presented (in thousands):
|  | 2017 |  | 2016 |  | 2015
Balances of liability awards at beginning of year |  | $ | 465 |  |  | $ | — |  |  | $ | 1,453 |
Expense for grants |  | 470 |  |  | 465 |  |  | — |
Settled |  | (935 | ) |  | — |  |  | (1,453 | )
Balance of liability awards at end of year |  | $ | — |  |  | $ | 465 |  |  | $ | — |
There was no unrecognized compensation expense for liability awards as of December 31, 2017. Stock Options The Company has not granted any stock options since 2012. The fair value of stock option grants was estimated on the grant date using the Black-Scholes option pricing model. The Company records compensation expense based on this value. The following summarizes pricing and term information for options outstanding as of December 31, 2017:
|  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  |  | Number Outstanding at |  | Weighted Average Remaining Contractual Life (years) |  | Weighted Average Exercise Price |  | Number Exercisable at |  | Weighted Average Exercise Price
Range of Exercise Prices |  | December 31, 2017 |  |  |  | December 31, 2017 |
$ | 4.44 |  |  | - |  | $ | 7.31 |  |  | 25,653 |  |  | 1.6 |  |  | $ | 6.25 |  |  |  | 25,653 |  |  |  | $ | 6.25 |  |
$ | 7.39 |  |  | - |  | $ | 7.39 |  |  | 3,500 |  |  | 2.3 |  |  | $ | 7.39 |  |  |  | 3,500 |  |  |  | $ | 7.39 |  |
$ | 8.26 |  |  | - |  | $ | 8.26 |  |  | 12,023 |  |  | 3.0 |  |  | $ | 8.26 |  |  |  | 12,023 |  |  |  | $ | 8.26 |  |
$ | 10.46 |  |  | - |  | $ | 10.46 |  |  | 16,494 |  |  | 3.9 |  |  | $ | 10.46 |  |  |  | 16,494 |  |  |  | $ | 10.46 |  |
$ | 16.51 |  |  | - |  | $ | 16.51 |  |  | 75,000 |  |  | 4.7 |  |  | $ | 16.51 |  |  |  | 75,000 |  |  |  | $ | 16.51 |  |
$ | 4.44 |  |  | - |  | $ | 16.51 |  |  | 132,670 |  |  | 3.8 |  |  | $ | 12.79 |  |  |  | 132,670 |  |  |  | $ | 12.79 |  |
The following table is a summary of stock option activity during 2017:
|  | Non- Qualified Stock Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2016 |  | 169,919 |  |  | $ | 12.10 |  |  |  | 4.3 |  |  | $ | 5,448,000 |
Exercised |  | (36,561 | ) |  | $ | 9.60 |  |  |  |  |  |  |  |
Canceled |  | (688 | ) |  | $ | 12.19 |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  | 132,670 |  |  | $ | 12.79 |  |  |  | 3.8 |  |  | $ | 6,830,000 |
Vested and Expected to Vest at December 31, 2017 |  | 132,670 |  |  | $ | 12.79 |  |  |  | 3.8 |  |  | $ | 6,830,000 |
Exercisable at December 31, 2017 |  | 132,670 |  |  | $ | 12.79 |  |  |  | 3.8 |  |  | $ | 6,830,000 |
The total intrinsic value of options exercised during 2017, 2016 and 2015 was $1.5 million, $4.7 million and $10.9 million, respectively. Employee Stock Purchase Plan Effective June 3, 2010, the stockholders of the Company approved the On Assignment 2010 Employee Stock Purchase Plan (the “ESPP”) for issuance of up to 3,500,000 shares of common stock. The ESPP allows eligible employees to purchase common stock of the Company, through payroll deductions, at a 15 percent discount of the lower of the market price on the first day or the last day of the semi-annual purchase periods. The ESPP is intended to qualify as an employee stock purchase plan under the Internal Revenue Service (“IRS”) Code Section 423. Eligible employees may contribute up to a certain percentage set by the plan administrator of their eligible earnings toward the purchase of the stock (subject to certain IRS limitations). As of December 31, 2017, there were 2,085,855 shares available for issuance under the ESPP. Shares of common stock are transferred to participating employees at the conclusion of each six-month offering period, which ends on the last business day of the month in March and September each year. Compensation expense is measured using a Black-Scholes option-pricing model. The table below presents the average fair value per share of shares purchased and the compensation expense under the ESPP (dollars in thousands, except per share amounts):
Year Ended December 31, |  | Average fair value per share |  | Shares |  | Expense |
2017 |  | $9.71 |  | 214,466 |  | $ | 2,092 |  |
2016 |  | $9.05 |  | 242,303 |  | $ | 2,497 |  |
2015 |  | $7.77 |  | 204,401 |  | $ | 1,586 |  |
Deferred Compensation Plan The Company has a Deferred Compensation Plan (the "Plan") that became effective on June 1, 2017, pursuant to which eligible management and highly compensated key employees, as defined by IRS regulations, may elect to defer a portion of their compensation to later years. These deferrals are immediately vested and are subject to investment risk and a risk of forfeiture under certain circumstances. Participants may choose from various investment options representing a broad range of asset classes. The Company established a rabbi trust to fund the Plan and at December 31, 2017 there was $2.2 million of deferred compensation in the rabbi trust, which is included in cash, cash equivalents and restricted cash, with a corresponding balance in other current liabilities in the accompanying consolidated balance sheet. Employee Defined Contribution Plans The Company maintains various 401(k) retirement savings plans for the benefit of our eligible U.S. employees. Under terms of these plans, eligible employees are able to make contributions to these plans on a tax-deferred basis. The Company makes matching contributions, some of which are discretionary. The Company made contributions to the 401(k) plans of $7.5 million, $5.6 million and $7.6 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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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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