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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company has an Omnibus Incentive and Equity Plan (the “Plan”) under which officers, employees and directors may be granted equity-based awards, including restricted stock units (“RSUs”), stock options and unrestricted shares of common stock. At December 31, 2017, 481,948 shares of common stock remain available for issuance of the 2,400,000 shares that are authorized for issuance under the Plan. Stock-based compensation expense is summarized as follows:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
($ in thousands) |  |  |  |  |
Stock-based compensation expense | $ | 20,288 |  |  | $ | 11,948 |  |  | $ | 11,863 |
Restricted Stock Units Each RSU entitles the holder to one share of common stock when the restriction expires. RSUs generally have a term of one to three years and may be time-vested or performance-contingent. The fair value of each RSU is estimated using the intrinsic value method, which is based on the fair market value price on the date of grant unless it contains a performance metric that is considered a market condition. RSUs that contain a market condition are valued using a simulation valuation model. Shares that are issued upon vesting are newly issued shares from the Plan and are not issued from treasury stock. RSU activity for the year ended December 31, 2017 is summarized as follows:
| Number of shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016 | 302,824 |  |  | $ | 111.56 |
Granted | 290,630 |  |  | $ | 108.32 |
Forfeited | (30,450 | ) |  | $ | 120.08 |
Settled | (79,983 | ) |  | $ | 141.24 |
Outstanding at December 31, 2017 | 483,021 |  |  | $ | 104.16 |
The grant-date intrinsic value of RSUs granted during the year ended December 31, 2017 was $31.5 million. The weighted-average grant-date fair value of RSUs granted during the years ended December 31, 2017, 2016 and 2015 was $108.32, $80.33 and $134.37 per share, respectively. The total fair value of RSUs vested during the years ended December 31, 2017, 2016 and 2015 was $11.3 million, $9.3 million and $11.8 million, respectively. For the years ended December 31, 2017, 2016 and 2015, a total of 32,716, 37,488 and 50,952 RSUs, respectively, were withheld through net share settlement by the Company to settle minimum employee tax withholding obligations. The Company paid $3.5 million, $1.5 million and $5.1 million for the years ended December 31, 2017, 2016 and 2015, respectively, in minimum employee tax withholding obligations related to RSUs withheld. These net share settlements had the effect of share repurchases by the Company as they reduced the number of shares that would have been otherwise issued as a result of the vesting. As of December 31, 2017 and 2016, unamortized stock-based compensation expense for outstanding RSUs was $29.3 million and $16.0 million with a weighted average remaining contractual life of 1.6 years and 1.4 years, respectively. The Company did not capitalize any stock-based compensation expenses during the years ended December 31, 2017, 2016 and 2015. During the years ended December 31, 2017 and 2016, the Company granted 87,458 and 33,244 RSUs, respectively, each of which contain performance-based metrics in addition to a service condition (Performance Share Units or "PSUs"). Compensation expense for these PSUs is recognized over a three-year service period based upon the value determined using a combination of the intrinsic value method, for awards that contain a performance metric that represents a "performance condition" in accordance with ASC 718, and the Monte Carlo simulation valuation model, for awards under the performance metric that represents a "market condition" under ASC 718. Compensation expense for the awards that contain a market condition is fixed at the date of grant and will not be adjusted in future periods based upon the achievement of the market condition. Compensation expense for the awards with a performance condition is recorded each period based upon a probability assessment of the expected outcome of the performance metric with a final adjustment upon the final outcome. For the years ended December 31, 2017 and 2016, total stock-based compensation expense included $7.3 million and $2.8 million respectively, for these PSUs. As of December 31, 2017 and 2016, unamortized stock-based compensation expense related to these PSUs was $7.6 million and $3.3 million, respectively. On June 1, 2017, the Company also granted 35,148 PSUs and 65,561 RSUs to certain RidgeWorth employees in connection with the Acquisition to replace equity incentives that were in place prior to the Acquisition. The PSUs will vest if certain performance measures are met over a five-year period, with the ability for accelerated vesting if those same conditions are met by year four. The RSUs contain only a service condition and will vest over four years beginning with year two. For the twelve months ended December 31, 2017, total stock-based compensation expense was $1.5 million for these PSUs and RSUs. At December 31, 2017, unamortized stock-based compensation expense related to these PSUs and RSUs was $8.6 million. Stock Options Stock option activity for the year ended December 31, 2017 is summarized as follows:
| Number of shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2016 | 137,157 |  |  | $ | 17.77 |
Granted | — |  |  | $ | — |
Exercised | (27,349 | ) |  | $ | 23.12 |
Forfeited | — |  |  | $ | — |
Outstanding at December 31, 2017 | 109,808 |  |  | $ | 16.44 |
Vested and exercisable at December 31, 2017 | 109,808 |  |  | $ | 16.44 |
Stock options generally cliff vest after three years and have a contractual life of ten years. Stock options are granted with an exercise price equal to the fair market value of the shares at the date of grant. The weighted-average remaining contractual term for stock options outstanding at December 31, 2017 and December 31, 2016 was 1.2 and 1.9 years, respectively. The weighted-average remaining contractual term for stock options vested and exercisable at December 31, 2017 was 1.2 years. At December 31, 2017, the aggregate intrinsic value of stock options outstanding and vested and exercisable was $10.8 million. There were no unvested stock options at December 31, 2017. The total intrinsic value of stock options exercised for the years ended December 31, 2017, 2016 and 2015 was $2.5 million, $1.3 million and $0.7 million, respectively. Cash received from stock option exercises was $0.1 million, $0.5 million and $0.1 million for 2017, 2016 and 2015, respectively. Employee Stock Purchase Plan The Company offers an employee stock purchase plan that allows employees to purchase shares of common stock on the open market at market price through after-tax payroll deductions. The initial transaction fees are paid for by the Company and shares of common stock are purchased on a quarterly basis. The Company does not reserve shares for this plan or discount the purchase price of the shares.

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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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