Stock Based Compensation Summary (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
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 1,955	$ 4,004	$ 3,901	$ 5,549	[1]
Income tax benefit	(744)	(1,521)	(1,486)	(2,108)	[1]
Net expense	$ 1,211	$ 2,483	$ 2,415	$ 3,441	[1]

[1] (1) Includes a total of $2.5 million, pretax, related to a separation agreement with our former chief executive officer.