CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Patient accounts receivable, allowance for uncollectible accounts	$ 26,020	$ 29,036
Property, building and equipment, accumulated depreciation	39,111	35,226
Intangible assets, accumulated amortization	$ 12,143	$ 10,968
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	40,000,000	40,000,000
Common stock, issued	22,617,280	22,429,041
Treasury stock at cost, shares	4,884,497	4,828,679