Stock Plans (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of the fair value of each incentive stock option and stock appreciation right

For the options granted in 2012, which are solely options granted to VIST employees to replace options outstanding at acquisition date, the expected term considered that the option grants were fully vested and in-the-money. The fair values of the grants are expensed over the vesting period.

	2013			2012			2011
Weighted per share average fair value at granted date	$	9.50		$	15.50		$	9.26
Risk-free interest rate		0.78	%		0.26	%		1.28	%
Expected dividend yield		4.00	%		3.80	%		4.10	%
Volatility		38.46	%		28.34	%		39.19	%
Expected life (years)		5.50			2.00			6.50

Schedule of activity related to restricted stock awards

The following table presents the activity related to restricted stock awards for the six months ended June 30, 2013.

	Number of Shares			Weighted Average Exercise Price
Unvested at January 1, 2013	$	43,053		$	37.89
Granted		106,325			40.60
Forfeited		(619	)		38.67
Unvested at June 30, 2013	$	148,759		$	39.82