Share-Based Compensation (Share-Based Compensation Arrangement Expenses Recognized) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Salaries, wages and employee benefits	$ 4,767	$ 4,406	$ 9,829	$ 9,169
Deferred income tax benefit	(1,853)	(1,732)	(3,818)	(3,576)
Net share-based compensation expense	$ 2,914	$ 2,674	$ 6,011	$ 5,593