STOCK-BASED COMPENSATION

Total stock-based compensation cost charged to selling, general and administrative expenses for the three and six months ended June 30, 2015 was $4.3 million and $6.1 million, respectively. Total stock-based compensation cost charged to selling, general and administrative expenses for the three and six months ended June 30, 2014 was $2.0 million and $4.3 million, respectively. The total income tax benefit recognized in the consolidated statements of income from stock-based compensation was $0.6 million and $1.1 million for the three and six months ended June 30, 2015, respectively. The total income tax benefit recognized in the consolidated statements of income from stock-based compensation was $0.5 million and $1.0 million for the three and six months ended June 30, 2014, respectively.

Restricted Stock Awards

The following information relates to restricted stock awards that have been granted to employees and directors under the Company's Plans. The restricted stock awards are not transferable until vested and the restrictions generally lapse upon the achievement of continued employment over a three-to-five-year period or service as a director until the following annual meeting of shareholders. The fair value of each restricted stock grant is based on the closing price of the Company's common stock on the date of grant and is amortized to expense over its vesting period.

The following table summarizes information about restricted stock awards for the six months ended June 30, 2015:



Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	383,021		$	56.51
Granted	134,937		$	55.26
Vested	(112,136	)	$	56.49
Forfeited	(17,178	)	$	56.43
Unvested June 30, 2015	388,644		$	56.09

As of June 30, 2015, there was $15.6 million of total unrecognized compensation cost arising from restricted stock awards under the Company's Plans. This cost is expected to be recognized over a weighted average period of 3.3 years. The total fair value of restricted stock vested during the three and six months ended June 30, 2015 was $3.0 million and $6.2 million, respectively. The total fair value of restricted stock vested during the three and six months ended June 30, 2014 was $5.3 million and $7.6 million, respectively.

Performance Stock Awards

The following information relates to performance stock awards that have been granted to employees under the Company's Plans. Performance stock awards are subject to performance criteria established by the compensation committee of the Company's board of directors prior to or at the date of grant. The vesting of the performance stock awards is based on achieving such targets typically based on revenue, Adjusted EBITDA margin, ROIC percentage and Total Recordable Incident Rate. In addition performance stock awards include continued service conditions. The fair value of each performance stock award is based on the closing price of the Company's common stock on the date of grant and is amortized to expense over the service period if achievement of performance measures is considered probable.

The following table summarizes information about performance stock awards for the six months ended June 30, 2015:



Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	143,875		$	60.94
Granted	165,778		$	56.51
Vested	(6,129	)	$	54.28
Forfeited	(3,923	)	$	61.02
Unvested June 30, 2015	299,601		$	58.63

During the three and six months ended June 30, 2015, the Company recorded $2.3 million of stock based compensation for performance stock awards originally issued in 2014 as it had become probable during the current period that such awards would be earned. As of June 30, 2015, there was $3.2 million of total unrecognized compensation cost arising from non-vested performance stock awards deemed probable of vesting under the Company's Plans. The total fair value of performance awards vested during the six months ended June 30, 2015 was $0.3 million. No performance awards vested during the three months ended June 30, 2015 and the three and six months ended June 30, 2014.

Common Stock Repurchases

On March 13, 2015, the Company's board of directors increased the size of the Company’s current share repurchase program from $150 million to $300 million. As of June 30, 2015, the Company had repurchased and retired a total of approximately 2.5 million shares of the Company's common stock for approximately $136.5 million under this program. As of June 30, 2015, an additional $163.5 million remains available for repurchase of shares under the current authorized program.