Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Stock Based Compensation [Abstract]

Assumptions used to estimate fair value of options granted

The Company records compensation expense for employee stock options and stock appreciation rights based on the estimated fair value of the options and stock appreciation rights on the date of grant using the Black-Scholes option-pricing model with the assumptions included in the table below. The Company uses historical data among other factors to estimate the expected price volatility, the expected term and the expected forfeiture rate. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for the estimated life of the option. The following assumptions were used to estimate the fair value of options and stock appreciation rights granted during the three-month periods ended March 31, 2013 and March 31, 2012, using the Black-Scholes option-pricing model.

	Three Months Ended			Three Months Ended
	March 31, 2013			March 31, 2012
Expected dividend yield		2.84	%		2.73	%
Expected stock price volatility		56.36	%		57.19	%
Risk-free interest rate		1.26	%		1.33	%
Weighted-average expected life of options		6.47	years		6.21	years
Forfeiture rate		2.5	%		3.0	%