the weighted average grant date fair value of options granted during 2012 , 2011 , and 2010 was $ 13 , $ 19 and $ 20 per share , respectively . the total intrinsic value of options exercised during the years ended december 31 , 2012 , 2011 and 2010 , was $ 19.0 million , $ 4.2 million and $ 15.6 million , respectively . in 2012 , the company granted 931340 shares of restricted class a common stock and 4048 shares of restricted stock units . restricted common stock and restricted stock units generally have a vesting period of 2 to 4 years . the fair value related to these grants was $ 54.5 million , which is recognized as compensation expense on an accelerated basis over the vesting period . beginning with restricted stock grants in september 2010 , dividends are accrued on restricted class a common stock and restricted stock units and are paid once the restricted stock vests . in 2012 , the company also granted 138410 performance shares . the fair value related to these grants was $ 7.7 million , which is recognized as compensation expense on an accelerated and straight-lined basis over the vesting period . the vesting of these shares is contingent on meeting stated performance or market conditions . the following table summarizes restricted stock , restricted stock units , and performance shares activity for 2012 : number of shares weighted average grant date fair value outstanding at december 31 , 2011 . . . . . . . . . . . . . . 1432610 $ 57 .
what was the average number of shares of class a common stock were issued to non-executive between 2010 and 2012
outstanding at december 31 , 2012 . . . . . . . . . . . . . . 1913527 54 the total fair value of restricted stock , restricted stock units , and performance shares that vested during the years ended december 31 , 2012 , 2011 and 2010 , was $ 20.9 million , $ 11.6 million and $ 10.3 million , respectively . eligible employees may acquire shares of class a common stock using after-tax payroll deductions made during consecutive offering periods of approximately six months in duration . shares are purchased at the end of each offering period at a price of 90% ( 90 % ) of the closing price of the class a common stock as reported on the nasdaq global select market . compensation expense is recognized on the dates of purchase for the discount from the closing price . in 2012 , 2011 and 2010 , a total of 27768 , 32085 and 21855 shares , respectively , of class a common stock were issued to participating employees . these shares are subject to a six-month holding period . annual expense of $ 0.1 million , $ 0.2 million and $ 0.1 million for the purchase discount was recognized in 2012 , 2011 and 2010 , respectively . non-executive directors receive an annual award of class a common stock with a value equal to $ 75000 . non-executive directors may also elect to receive some or all of the cash portion of their annual stipend , up to $ 25000 , in shares of stock based on the closing price at the date of distribution . as a result , 40260 , 40585 and 37350 shares of class a common stock were issued to non-executive directors during 2012 , 2011 and 2010 , respectively . these shares are not subject to any vesting restrictions . expense of $ 2.2 million , $ 2.1 million and $ 2.4 million related to these stock-based payments was recognized for the years ended december 31 , 2012 , 2011 and 2010 , respectively . 19 . fair value measurements in general , the company uses quoted prices in active markets for identical assets to determine the fair value of marketable securities and equity investments . level 1 assets generally include u.s . treasury securities , equity securities listed in active markets , and investments in publicly traded mutual funds with quoted market prices . if quoted prices are not available to determine fair value , the company uses other inputs that are directly observable . assets included in level 2 generally consist of asset- backed securities , municipal bonds , u.s . government agency securities and interest rate swap contracts . asset-backed securities , municipal bonds and u.s . government agency securities were measured at fair value based on matrix pricing using prices of similar securities with similar inputs such as maturity dates , interest rates and credit ratings . the company determined the fair value of its interest rate swap contracts using standard valuation models with market-based observable inputs including forward and spot exchange rates and interest rate curves. .