Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Stockholders' Equity Note [Abstract]

Schedule of Share-based Compensation, Restricted Stock Activity

The following table presents restricted stock activity for the years 2016, 2015 and 2014:



	2016				2015				2014
	# 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	197,674		$	43.56	366,363		$	38.24	318,561		$	35.82
Granted	150,647		39.47		107,346		45.34		201,680		39.55
Forfeited	(51,234	)	43.56		(39,322	)	40.93		(675	)	48.68
Vested	(72,798	)	42.06		(236,713	)	36.57		(153,203	)	34.89
Nonvested restricted shares outstanding at December 31	224,289		$	41.30	197,674		$	43.56	366,363		$	38.24

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,
	2016			2015			2014
Numerator (basic and diluted):
Net income	$	82.8		$	89.7		$	89.7
Less: Dividends paid to participating securities	(0.3		)	(0.2		)	(0.3		)
Less: Undistributed earnings available to participating securities	(0.2		)	(0.3		)	(0.5		)
Undistributed and distributed earnings available to common stockholders	$	82.3		$	89.2		$	88.9

Denominator:
Average number of common shares outstanding	30,310.9			30,251.4			30,238.0
Effect of dilutive stock-based compensation	152.5			122.9			118.5
Average number of common and potential common shares outstanding	30,463.4			30,374.3			30,356.5