Dispositions (Components of income (loss) from discontinued operations, net of tax) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Dispositions [Abstract]
Revenues		$ 28,300	$ 16,231	$ 88,198
Income (loss) from discontinued operations before income tax		7,492	(8,249)	18,291
Income tax expense (benefit)		2,711	(1,771)	6,605
Gain (loss) on disposition, net of tax			(10,729)	5,455
Income (loss) from discontinued operations, net of tax		4,781	(17,207)	17,141
Gain (loss) on disposition, tax		$ 0	$ (2,090)	$ 3,103