Goodwill and Identifiable Intangible Assets, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended	1 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2012 item	Dec. 31, 2011	Nov. 30, 2011 EAS
Changes in the carrying amount of goodwill
Balance at the beginning of period			$ 107,093	$ 147,818
Additions			7,500	16,629	15,700
Impairment adjustment	2,200	55,100		57,354
Balance at the end of period	$ 107,093		$ 114,593	$ 107,093
Number of reporting units serving the Virginia, Maryland and North Carolina markets, which could no longer support the related goodwill balance			4