Goodwill and Other Intangible Assets (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 VN segment	Mar. 31, 2013 PC segment	Mar. 31, 2013 Non-compete Agreements	Dec. 31, 2012 Non-compete Agreements	Mar. 31, 2013 Certificates of Need and licenses	Dec. 31, 2012 Certificates of Need and licenses	Mar. 31, 2013 Trade Names	Dec. 31, 2012 Trade Names
Goodwill and Other Intangible Assets
Impairment loss on goodwill and other intangible assets	$ 0
Goodwill
Balance at the beginning of the period	133,418,000		102,497,000	30,921,000
Balance at the end of the period	133,418,000		102,497,000	30,921,000
Other Intangible Assets
Balance at the beginning of the period	19,967,000				132,000	155,000	9,391,000	9,391,000	10,421,000	10,421,000
Amortization	(23,000)				(23,000)
Balance at the end of the period	19,944,000				132,000	155,000	9,391,000	9,391,000	10,421,000	10,421,000
Amortization expense recognized on finite-lived intangible assets	$ 23,000	$ 16,000