CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Patient accounts receivable, allowance for uncollectible accounts	$ 14,334	$ 11,863
Property, building and equipment, accumulated depreciation	40,935	34,331
Intangible assets, accumulated amortization	$ 4,518	$ 3,054
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	21,801,634	21,578,772
Treasury stock at cost, shares	4,693,647	4,653,039