Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Schedule of Share-based Compensation, Restricted Stock Activity

The following table presents restricted stock activity for the years 2015, 2014 and 2013:



	2015				2014				2013
	# 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	366,363		$	38.24	318,561		$	35.82	433,382		$	18.94
Granted	107,346		45.34		201,680		39.55		274,172		36.47
Forfeited	(39,322	)	40.93		(675	)	48.68		(42,711	)	33.71
Vested	(236,713	)	36.57		(153,203	)	34.89		(346,282	)	15.33
Nonvested restricted shares outstanding at December 31	197,674		$	43.56	366,363		$	38.24	318,561		$	35.82

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,
	2015			2014			2013
Numerator (basic and diluted):
Net income	$	89.7		$	89.7		$	76.1
Less: Dividends paid to participating securities	(0.2		)	(0.3		)	(0.2		)
Less: Undistributed earnings available to participating securities	(0.3		)	(0.5		)	(0.4		)
Undistributed and distributed earnings available to common stockholders	$	89.2		$	88.9		$	75.5

Denominator:
Average number of common shares outstanding	30,251.4			30,238.0			31,056.7
Effect of dilutive stock-based compensation	122.9			118.5			181.6
Average number of common and potential common shares outstanding	30,374.3			30,356.5			31,238.3