CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Patient accounts receivable, allowance for uncollectible accounts	$ 29,036	$ 26,712
Property, building and equipment, accumulated depreciation	35,226	38,907
Intangible assets, accumulated amortization	$ 10,968	$ 8,496
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	22,429,041	22,224,423
Treasury stock at cost, shares	4,828,679	4,776,560