Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share Based Compensation and Related Benefits

For the three months ended March 31, 2013 and 2012, we recorded share-based compensation and related tax benefits as follows:

	Three months ended March 31,
(Dollars in thousands)	2013			2012
Share-based compensation expense	$	5,826		$	5,149
Income tax benefit related to share-based compensation expense	(1,603		)	(1,199		)

Unrecognized Share Based Compensation Expense

As of March 31, 2013, unrecognized share-based compensation expense was as follows:

(Dollars in thousands)	Unrecognized   Expense		Average Expected Recognition   Period - in Years
Stock options	$	13,646	2.43
Restricted stock units	21,643		2.51
Total unrecognized share-based compensation expense	$	35,289

Stock Option Information Related to Equity Incentive Plan

The table below provides stock option information related to the 1997 Equity Incentive Plan and the 2006 Equity Incentive Plan for the three months ended March 31, 2013:

	Options		Weighted Average  Exercise Price		Weighted Average Remaining Contractual   Life in Years	Aggregate   Intrinsic Value   of In-The- Money Options
Outstanding at December 31, 2012	2,060,413		$	49.15
Granted	—		—
Exercised	(265,814	)	48.53
Forfeited	(8,769	)	52.95
Expired	(200	)	46.48
Outstanding at March 31, 2013	1,785,630		49.22		4.05	$	38,785,843
Vested and expected to vest at March 31, 2013	1,725,072		48.84		4.00	38,116,691
Exercisable at March 31, 2013	831,168		43.23		2.89	23,032,874

Information for Restricted Stock Units under Equity Incentive Plan

The table below provides information for restricted stock units under the 2006 Equity Incentive Plan for the three months ended March 31, 2013:

	Shares		Weighted Average     Grant Date Fair     Value
Nonvested at December 31, 2012	585,543		$	59.42
Granted	3,700		60.92
Vested	(4,228	)	47.89
Forfeited	(3,334	)	57.97
Nonvested at March 31, 2013	581,681		59.52