CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Patient accounts receivable, allowance for uncollectible accounts	$ 26,089	$ 29,036
Property, building and equipment, accumulated depreciation	41,876	35,226
Intangible assets, accumulated amortization	$ 12,607	$ 10,968
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	40,000,000	40,000,000
Common stock, issued	22,635,322	22,429,041
Treasury stock at cost, shares	4,890,181	4,828,679