Share-Based Compensation: (Tables)

9 Months Ended

Sep. 30, 2012

Share-Based Compensation:

Stock Option Activity

									Weighted		Weighted
					1998				Average		Average	Aggregate
	2007		1998		Director		Total		Exercise		Contractual	Intrinsic
	Plan		Plan		Plan		Shares		Price		Life	Value
Outstanding, January 1, 2012	1,329		572		195		2,096		$	20.11
Granted	111		—		—		111		$	23.74
Exercised	(430	)	(190	)	(49	)	(669	)	$	17.54
Forfeited and expired	(5	)	(78	)	—		(83	)	$	25.14
Outstanding, September 30, 2012	1,005		304		146		1,455		$	21.29	5.6	$	1,821
Exercisable, September 30, 2012	551		304		146		1,001		$	21.61	4.5	$	1,362

Non-Vested Restricted Stock Unit Activity

	2007
	Plan		Weighted
	Restricted		Average
	Stock		Grant-Date
	Units		Fair Value
Outstanding, January 1, 2012	394		$	18.45
Granted	218		$	18.11
Vested	(154	)	$	16.57
Canceled	(106	)	$	20.62
Outstanding, September 30, 2012	352		$	18.41

Summary of Compensation Cost and Other Measures Related to Share-Based Payments

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
Share-based expense (net of estimated forfeitures):
Stock options	$	0.2		$	0.2		$	0.6		$	0.6
Non-vested stock/Restricted stock units	0.9			0.5			2.3			1.4
Total share-based expense	1.1			0.7			2.9			2.0
Total recognized tax benefit	(0.4		)	(0.3		)	(1.2		)	(0.8		)
Share-based expense (net of tax)	$	0.7		$	0.4		$	1.7		$	1.2