Common Stock	12 Months Ended
Dec. 31, 2016
Common Stock
Common Stock	9. Common Stock Share-Based Compensation. Approximately $6.7 million, $5.8 million, and $5.3 million of share-based compensation expense was recorded in fiscal 2016, fiscal 2015, and fiscal 2014, respectively, as an increase to common stock for share-based payment awards made to CRA's employees and directors, based on the estimated grant date fair values of stock options, shares of restricted stock, and restricted stock units vesting during the period. CRA also recorded $146,000, $11,000, and $271,000 for fiscal 2016, fiscal 2015, and fiscal 2014, respectively, in shared-based compensation expense for grants to non-employees (other than directors). Restricted Share Vesting. In fiscal 2016, fiscal 2015, and fiscal 2014, 201,905, 106,504, and 149,195 shares of restricted stock and restricted stock units vested, respectively. CRA redeemed 69,000, 28,900, and 41,470 of these shares from their holders in order to pay $1.9 million, $0.7 million, and $1.2 million, respectively, of employee tax withholdings. Common Stock Repurchases and Retirements. On October 23, 2014 and March 21, 2016, CRA's Board of Directors authorized the repurchase of up to $30.0 million and $20.0 million, respectively, of CRA's common stock. Repurchases under these programs are discretionary and CRA may make such repurchases under any of these programs in the open market (including under any Rule 10b5-1 plan adopted by CRA) or in privately negotiated transactions, in each case in accordance with applicable insider trading and other securities laws and regulations. CRA records the retirement of its repurchased shares as a reduction to common stock. During fiscal 2016, CRA repurchased and retired 783,703 shares under these share repurchase programs at an aggregate price of approximately $19.1 million, resulting in approximately $9.0 million available for future repurchases as of December 31, 2016. During fiscal 2015, CRA repurchased and retired 477,292 shares under these share repurchase programs at an aggregate price of approximately $12.8 million, resulting in approximately $8.1 million available for future repurchases as of January 2, 2016. During fiscal 2014, CRA repurchased and retired 971,515 shares under these share repurchase programs at an aggregate price of approximately $25.5 million, resulting in approximately $20.9 million available for future repurchases as of January 3, 2015. Tender Offer. During fiscal 2016, a total of 1,164 shares of common stock were tendered in conjunction with a modified "Dutch Auction" self tender offer at a purchase price of $19.75 per share. Exercise of Stock Options. During fiscal 2016, 124,931 options were exercised for $2.9 million of proceeds. During fiscal 2015, 29,288 options were exercised for $0.6 million of proceeds. During fiscal 2014, 20,931 options were exercised for $0.5 million of proceeds. Tax Benefits and Deficits on Stock Option Exercises and Restricted Share Vesting. In fiscal 2016 and 2015, CRA recorded a net tax deficit on stock option exercises, expirations and the vesting of shares of restricted stock and restricted stock units, as a decrease to common stock totaling $0.2 million and $0.4 million, respectively. In fiscal 2014, CRA recorded $0.1 million of a net tax benefit on stock option exercises, expirations and the vesting of shares of restricted stock and restricted stock units, as an increase to common stock.

9. Common Stock

Share-Based Compensation. Approximately $6.7 million, $5.8 million, and $5.3 million of share-based compensation expense was recorded in fiscal 2016, fiscal 2015, and fiscal 2014, respectively, as an increase to common stock for share-based payment awards made to CRA's employees and directors, based on the estimated grant date fair values of stock options, shares of restricted stock, and restricted stock units vesting during the period.

CRA also recorded $146,000, $11,000, and $271,000 for fiscal 2016, fiscal 2015, and fiscal 2014, respectively, in shared-based compensation expense for grants to non-employees (other than directors).

Restricted Share Vesting. In fiscal 2016, fiscal 2015, and fiscal 2014, 201,905, 106,504, and 149,195 shares of restricted stock and restricted stock units vested, respectively. CRA redeemed 69,000, 28,900, and 41,470 of these shares from their holders in order to pay $1.9 million, $0.7 million, and $1.2 million, respectively, of employee tax withholdings.

Common Stock Repurchases and Retirements. On October 23, 2014 and March 21, 2016, CRA's Board of Directors authorized the repurchase of up to $30.0 million and $20.0 million, respectively, of CRA's common stock. Repurchases under these programs are discretionary and CRA may make such repurchases under any of these programs in the open market (including under any Rule 10b5-1 plan adopted by CRA) or in privately negotiated transactions, in each case in accordance with applicable insider trading and other securities laws and regulations. CRA records the retirement of its repurchased shares as a reduction to common stock.

During fiscal 2016, CRA repurchased and retired 783,703 shares under these share repurchase programs at an aggregate price of approximately $19.1 million, resulting in approximately $9.0 million available for future repurchases as of December 31, 2016. During fiscal 2015, CRA repurchased and retired 477,292 shares under these share repurchase programs at an aggregate price of approximately $12.8 million, resulting in approximately $8.1 million available for future repurchases as of January 2, 2016. During fiscal 2014, CRA repurchased and retired 971,515 shares under these share repurchase programs at an aggregate price of approximately $25.5 million, resulting in approximately $20.9 million available for future repurchases as of January 3, 2015.

Tender Offer. During fiscal 2016, a total of 1,164 shares of common stock were tendered in conjunction with a modified "Dutch Auction" self tender offer at a purchase price of $19.75 per share.

Exercise of Stock Options. During fiscal 2016, 124,931 options were exercised for $2.9 million of proceeds. During fiscal 2015, 29,288 options were exercised for $0.6 million of proceeds. During fiscal 2014, 20,931 options were exercised for $0.5 million of proceeds.

Tax Benefits and Deficits on Stock Option Exercises and Restricted Share Vesting. In fiscal 2016 and 2015, CRA recorded a net tax deficit on stock option exercises, expirations and the vesting of shares of restricted stock and restricted stock units, as a decrease to common stock totaling $0.2 million and $0.4 million, respectively. In fiscal 2014, CRA recorded $0.1 million of a net tax benefit on stock option exercises, expirations and the vesting of shares of restricted stock and restricted stock units, as an increase to common stock.