Property and Equipment Depreciation expense recorded in continuing operations (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
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 3,075	$ 2,799	$ 8,970	$ 7,735