Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Patient accounts receivable, allowance for uncollectible accounts	$ 11,863	$ 10,692
Property, building and equipment, accumulated depreciation	34,331	28,073
Intangible assets, accumulated amortization	$ 2,985	$ 2,325
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	21,578,772	21,374,264
Common stock, shares outstanding	16,925,733	18,298,659
Treasury stock at cost, shares	4,653,039	3,075,605