CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Patient accounts receivable, allowance for uncollectible accounts	$ 13,995	$ 11,863
Property, building and equipment, accumulated depreciation	39,320	34,331
Intangible assets, accumulated amortization	$ 3,357	$ 2,985
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	21,783,323	21,578,772
Treasury stock at cost, shares	4,690,392	4,653,039