Share-Based Compensation:

6 Months Ended

Jun. 30, 2013

Share-Based Compensation:

Share-Based Compensation:

(6) Share-Based Compensation:  During the six months ended June 30, 2013, the Company granted no non-qualified stock options to purchase shares of the Company’s common stock.

Activity in the Company’s stock option plans for the six months ended June 30, 2013, was as follows (in thousands, except weighted average exercise price and weighted average contractual life):

									Weighted		Weighted
					1998				Average		Average	Aggregate
	2007		1998		Director		Total		Exercise		Contractual	Intrinsic
	Plan		Plan		Plan		Shares		Price		Life	Value
Outstanding, January 1, 2013	954		253		146		1,353		$	21.15
Granted	—		—		—		—		$	—
Exercised	(42	)	—		(6	)	(48	)	$	17.41
Forfeited and expired	(6	)	(2	)	—		(8	)	$	21.74
Outstanding, June 30, 2013	906		251		140		1,297		$	21.28	5.1	$	4,897
Exercisable, June 30, 2013	704		251		140		1,095		$	21.14	4.6	$	4,307

The following table summarizes non-vested restricted stock unit activity through June 30, 2013, (in thousands, except weighted average grant-date fair value amounts):

	2007
	Plan		Weighted
	Restricted		Average
	Stock		Grant-Date
	Units		Fair Value
Outstanding, January 1, 2013	356		$	17.97
Granted	367		$	26.64
Vested	(152	)	$	17.20
Canceled	—		$	0.00
Outstanding, June 30, 2013	571		$	23.76

Restricted stock unit awards vest over three years.  A portion of the awards vest based on a service period, and are expensed over the three-year vesting period.  Prior to 2013, the Company also granted performance-based awards that vest over a three-year period, provided that the Company met certain performance targets in the first year of the grant.  During the first quarter of 2013 the Company granted new performance-based awards tied to the Company’s average annual return on invested capital (which the Company refers to as “average ROIC”), as measured over the three-year period beginning January 1, 2013 and ending December 31, 2015.  Performance Share awards for the senior leadership team will also be modified based on total shareholder return performance (which the Company refers to as the “TSR modifier”) measured over the same three-year period.  The relative TSR is based on the Company’s total shareholder return over the three-year measurement period relative to the shareholder return over the same period for the companies comprising the S&P Transportation Select Industry Index and S&P MidCap 400 Index (with each index weighted 50%).  The service-vesting provisions of each performance based award require the award recipient to remain in continuous service with the Company until the end of the three-year measurement period, subject to certain exceptions due to retirement, disability, or death, in order to vest in any shares that become issuable on the basis of the performance-vesting criteria.

A summary of compensation cost related to share-based payments for the three and six months ended June 30, 2013 and 2012, exclusive of A&B related compensation prior to the Separation, is as follows (in millions):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Share-based expense (net of estimated forfeitures):
Stock options	$	0.1		$	0.2		$	0.2		$	0.4
Non-vested stock/Restricted stock units	1.4			0.6			2.6			1.4
Total share-based expense	1.5			0.8			2.8			1.8
Total recognized tax benefit	(0.6		)	(0.3		)	(1.1		)	(0.7		)
Share-based expense (net of tax)	$	0.9		$	0.5		$	1.7		$	1.1