CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Patient accounts receivable, allowance for uncollectible accounts	$ 14,819	$ 14,334
Property, building and equipment, accumulated depreciation	42,475	40,935
Intangible assets, accumulated amortization	$ 4,985	$ 4,518
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	40,000,000	40,000,000
Common stock, issued	21,949,411	21,801,634
Treasury stock at cost, shares	4,724,491	4,693,647