Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

Stockholders' Equity Note [Abstract]

Schedule of Share-based Compensation, Restricted Stock Activity

The following table presents restricted stock activity for the years 2014, 2013 and 2012:



	2014				2013				2012
	# of Shares		Weighted Average Fair Value at Date of Grant		# of Shares		Weighted Average Fair Value at Date of Grant		# of Shares		Weighted Average Fair Value at Date of Grant
Nonvested restricted shares outstanding at January 1	318,561		$	35.82	433,382		$	18.94	359,306		$	13.79
Granted	201,680		39.55		274,172		36.47		137,026		29.56
Forfeited	(675	)	48.68		(42,711	)	33.71		—		—
Vested	(153,203	)	34.89		(346,282	)	15.33		(62,950	)	12.84
Nonvested restricted shares outstanding at December 31	366,363		$	38.24	318,561		$	35.82	433,382		$	18.94

Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation

A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands):



	For the Years Ended December 31,
	2014			2013			2012
Numerator (basic and diluted):
Net income	$	89.7		$	76.1		$	79.8
Less: Dividends paid to participating securities	(0.3		)	(0.2		)	(0.2		)
Less: Undistributed earnings available to participating securities	(0.5		)	(0.4		)	(0.9		)
Undistributed and distributed earnings available to common stockholders	$	88.9		$	75.5		$	78.7

Denominator:
Average number of common shares outstanding	30,238.0			31,056.7			30,986.2
Effect of dilutive stock-based compensation	118.5			181.6			355.7
Average number of common and potential common shares outstanding	30,356.5			31,238.3			31,341.9