Accounting for Stock Compensation	9 Months Ended
Sep. 30, 2017
Accounting For Stock Based Compensation [Abstract]
Accounting for Stock Compensation	NOTE 9 – ACCOUNTING FOR STOCK COMPENSATION The ICF International, Inc. 2010 Omnibus Incentive Plan (as amended, the “Omnibus Plan”) provides for the granting of options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance shares, performance units, cash-based awards, and other stock-based awards to all officers, key employees, and non-employee directors of the Company. As of September 30, 2017, the Company had approximately 1.9 million shares available for grant under the Omnibus Plan. Cash-settled RSUs (“CSRSUs”) have no impact on the shares available for grant under the Omnibus Plan, nor on the calculated shares used in earnings per share (“EPS”) calculations. During the nine months ended September 30, 2017, the Company granted to its employees approximately 0.2 million shares in the form of RSUs with an average grant date fair value of $41.35, and the equivalent value of approximately 0.2 million shares in the form of CSRSUs with an average grant date fair value of $41.72. During the nine months ended September 30, 2017, the Company also granted approximately 0.1 million shares in the form of performance-based share awards (“PSAs”) to its employees with a grant date fair value of $38.81 per share. The RSUs, CSRSUs and PSAs granted are generally subject to service-based vesting conditions, with the PSAs also having performance-based vesting conditions. The performance conditions for the PSAs granted in 2017 have a performance period from January 1, 2017 through December 31, 2019 and the performance conditions are consistent with the PSAs granted in the prior years, except for a lower assumed compounded annual growth rate in the earnings per share during the performance period and a higher threshold for the Company to maximize performance shares to be awarded. The Company’s performance-based share program is further described in “Note 13—Accounting for Stock-Based Compensation”, in the “Notes to Consolidated Financial Statements” in the Annual Report. The Company recognized stock-based compensation expense of $5.2 million and $4.7 million for the three months ended September 30, 2017 and 2016, respectively, and $13.4 million and $12.8 million for the nine months ended September 30, 2017 and 2016, respectively. Unrecognized compensation expense of approximately $14.8 million as of September 30, 2017 related to unsettled RSUs is expected to be recognized over a weighted-average period of 2.2 years. The unrecognized compensation expense related to CSRSUs totaled approximately $16.4 million at September 30, 2017 and is expected to be recognized over a weighted-average period of 2.1 years. Unrecognized compensation expense related to PSAs of approximately $3.3 million as of September 30, 2017 is expected to be recognized over a weighted-average period of 1.3 years.

NOTE 9 – ACCOUNTING FOR STOCK COMPENSATION

The ICF International, Inc. 2010 Omnibus Incentive Plan (as amended, the “Omnibus Plan”) provides for the granting of options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance shares, performance units, cash-based awards, and other stock-based awards to all officers, key employees, and non-employee directors of the Company. As of September 30, 2017, the Company had approximately 1.9 million shares available for grant under the Omnibus Plan. Cash-settled RSUs (“CSRSUs”) have no impact on the shares available for grant under the Omnibus Plan, nor on the calculated shares used in earnings per share (“EPS”) calculations.

During the nine months ended September 30, 2017, the Company granted to its employees approximately 0.2 million shares in the form of RSUs with an average grant date fair value of $41.35, and the equivalent value of approximately 0.2 million shares in the form of CSRSUs with an average grant date fair value of $41.72. During the nine months ended September 30, 2017, the Company also granted approximately 0.1 million shares in the form of performance-based share awards (“PSAs”) to its employees with a grant date fair value of $38.81 per share. The RSUs, CSRSUs and PSAs granted are generally subject to service-based vesting conditions, with the PSAs also having performance-based vesting conditions. The performance conditions for the PSAs granted in 2017 have a performance period from January 1, 2017 through December 31, 2019 and the performance conditions are consistent with the PSAs granted in the prior years, except for a lower assumed compounded annual growth rate in the earnings per share during the performance period and a higher threshold for the Company to maximize performance shares to be awarded. The Company’s performance-based share program is further described in “Note 13—Accounting for Stock-Based Compensation”, in the “Notes to Consolidated Financial Statements” in the Annual Report.

The Company recognized stock-based compensation expense of $5.2 million and $4.7 million for the three months ended September 30, 2017 and 2016, respectively, and $13.4 million and $12.8 million for the nine months ended September 30, 2017 and 2016, respectively. Unrecognized compensation expense of approximately $14.8 million as of September 30, 2017 related to unsettled RSUs is expected to be recognized over a weighted-average period of 2.2 years. The unrecognized compensation expense related to CSRSUs totaled approximately $16.4 million at September 30, 2017 and is expected to be recognized over a weighted-average period of 2.1 years. Unrecognized compensation expense related to PSAs of approximately $3.3 million as of September 30, 2017 is expected to be recognized over a weighted-average period of 1.3 years.