Note 10. Stock‑Based Compensation Plans

We grant stock‑based compensation to our employees and directors. At December 31, 2015, an aggregate of 2,251,507 shares were authorized for future grant under our various stock‑based compensation plans, including stock options, restricted stock units, and restricted stock awards. Awards that expire or are canceled without delivery of shares generally become available for issuance under the plans. Upon exercises of stock options, vesting of restricted stock units, and vesting of restricted shares under all of our stock plans, we issue new shares of Reliance common stock.

Stock Options

Stock option activity under all the plans is as follows:


				Weighted Average
				Remaining	Aggregate
	Option	Weighted Average		Contractual Term	Intrinsic Value
Stock Options	Shares	Exercise Price		(In years)	(In millions)

Outstanding at January 1, 2013	3,405,500	$	49.12
Exercised	(1,437,053)		48.78
Expired or forfeited	(31,206)		51.37
Outstanding at December 31, 2013	1,937,241		49.35
Exercised	(593,204)		48.58
Expired or forfeited	(16,625)		52.13
Outstanding at December 31, 2014	1,327,412		49.66
Exercised	(390,606)		48.19
Expired or forfeited	(2,481)		51.96
Outstanding at December 31, 2015	934,325	$	50.26	1.8	$	7.4
Exercisable at December 31, 2015	934,325	$	50.26	1.8	$	7.4

All options outstanding at December 31, 2015 had four-year vesting periods and seven-year terms, with the exception of 102,000 options granted to our non‑employee directors that had one-year vesting periods and ten-year terms.

A summary of the status of our unvested stock options as of December 31, 2015 and changes during the year then ended is as follows:


		Weighted
		Average Grant
Unvested Options	Shares	Date Fair Value

Unvested at January 1, 2015	222,413	$	26.98
Forfeited	(625)		26.98
Vested	(221,788)		26.98
Unvested at December 31, 2015	—	$	—

Proceeds from stock options exercised under all stock option plans in 2015, 2014 and 2013 were $15.1 million, $28.8 million and $70.1 million, respectively. The total intrinsic values of all options exercised during the years ended December 31, 2015, 2014 and 2013 were $4.8 million, $13.5 million and $29.0 million, respectively.

The tax benefit realized from option exercises during the years ended December 31, 2015, 2014 and 2013 were $7.6 million, $10.7 million and $11.5 million, respectively.

The following tabulation summarizes certain information concerning outstanding and exercisable options as of December 31, 2015:


		Options Outstanding			Options Exercisable
		Weighted Average				Weighted Average
		Remaining	Weighted			Exercise
Range of	Outstanding at	Contractual Life	Average		Exercisable at	Price of Options
Exercise Price	December 31, 2015	in Years	Exercise Price		December 31, 2015	Exercisable

$33 - $38	71,000	1.1	$	34.79	71,000	$	34.79
$42 - $45	312,425	1.4		43.01	312,425		43.01
$55 - $56	508,900	2.1		55.73	508,900		55.73
$61 - $67	42,000	2.0		64.16	42,000		64.16
$33 - $67	934,325	1.8	$	50.26	934,325	$	50.26

Restricted Stock

In 2015, 2014 and 2013, we granted 507,760, 349,380 and 327,780, respectively, restricted stock units (“RSUs”) to key employees pursuant to the Amended and Restated Stock Option and Restricted Stock Plan. Each RSU consists of the right to receive one share of our common stock and dividend equivalent rights, subject to forfeiture, equal to the accrued cash or stock dividends where the record date for such dividends is after the grant date but before the shares vest. Additionally, each 2015, 2014 and 2013 RSU granted has a time-based condition and cliff vests at December 31, 2017, December 31, 2016 and December 31, 2015, respectively, if the recipient is an employee on those dates. In addition to the time-based condition, 185,450, 136,162, and 136,225 of the RSUs granted in 2015, 2014 and 2013, respectively, also have performance goals and vest only upon the satisfaction of the time-based condition and certain three-year performance targets. In addition to the 2015 RSUs described above, we also granted 10,000 time-based and 40,000 performance-based RSUs to our former CEO as a result of his expected retirement in July 2016 that have a time-based condition and eighteen-month performance targets ending June 30, 2016. The fair value of the 2015, 2014 and 2013 RSUs granted was $59.27 per share, $71.15 per share and $65.75 per share, respectively, determined based on the closing price of our common stock on the grant date.

In 2011 and 2010, we granted 86,000 and 61,000 shares, respectively, of restricted stock to certain officers of the Company. The awards include dividend rights and vest over five years. The fair value of the 2011 and 2010 restricted stock grants was $37.29 per share and $41.24 per share, respectively, determined based on the closing price of our common stock on the grant date. As of December 31, 2015, 17,200 of these shares remain unvested and outstanding.

In 2015, 2014 and 2013, 12,719, 11,830, and 12,418 shares of restricted stock, respectively, were granted to the non‑employee members of the Board of Directors pursuant to the Directors Equity Plan. The fair value of the restricted stock granted in 2015, 2014, and 2013, was $66.03 per share, $70.99 per share, and $67.63 per share, respectively, the closing price of our common stock on the grant date. The awards include dividend rights and vest immediately upon grant. The recipients are restricted from trading the restricted stock for one year from date of grant.

A summary of the status of our unvested restricted stock grants and service and performance based RSUs as of December 31, 2015 and changes during the year then ended is as follows:


		Weighted
		Average Grant
Unvested Shares	Shares	Date Fair Value

Unvested at January 1, 2015	846,760	$	65.10
Granted	570,479		59.42
Forfeited	(106,205)		60.03
Vested	(410,624)		62.56
Unvested at December 31, 2015	900,410	$	63.26

Unrecognized Compensation Cost

As of December 31, 2015, there was approximately $27.3 million of total unrecognized compensation cost related to unvested stock‑based compensation awards granted under all stock‑based compensation plans. That cost is expected to be recognized over a weighted average period of 1.36 years.