Quarterly Financial Information (Unaudited) (Schedule of Selected Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Patient revenues, net	$ 144,367		$ 146,377		$ 142,550		$ 141,500		$ 135,000		$ 97,313		$ 95,805		$ 97,945		$ 574,794	$ 426,063	$ 387,595
Professional liability expense	2,753	[1]	2,617	[1]	2,724	[1]	2,670	[1]	2,479	[2]	1,977	[2]	1,934	[2]	2,066	[2]	10,764	8,456	8,122
Income (loss) from continuing operations	(5,947)		(581)		381		1,348		1,438		(958)		(2,150)		(74)		(4,799)	(1,744)	2,752
Loss from discontinued operations	14		1		(28)		(15)		(13)		(17)		0		(37)		(28)	(67)	(1,128)
NET INCOME (LOSS)	$ (5,933)		$ (580)		$ 353		$ 1,333		$ 1,425		$ (975)		$ (2,150)		$ (111)		$ (4,827)	$ (1,811)	$ 1,624
Basic net income per common share
Income (loss) from continuing operations (in dollars per share)	$ (0.94)		$ (0.09)		$ 0.06		$ 0.22		$ 0.24		$ (0.16)		$ (0.35)		$ (0.01)		$ (0.76)	$ (0.28)	$ 0.45
Discontinued operations (in dollars per share)	0.00		0.00		0.00		0.00		0.00		0.00		0.00		(0.01)		(0.01)	(0.01)	(0.18)
Net income (loss) (in dollars per share)	(0.94)		(0.09)		0.06		0.22		0.24		(0.16)		(0.35)		(0.02)		(0.77)	(0.29)	0.27
Diluted net income per common share
Income (loss) from continuing operations (in dollars per share)	(0.94)		(0.09)		0.06		0.21		0.24		(0.16)		(0.35)		(0.01)		(0.76)	(0.28)	0.44
Discontinued operations (in dollars per share)	0.00		0.00		0.00		0.00		0.00		0.00		0.00		(0.01)		(0.01)	(0.01)	(0.18)
Diluted net income (loss) per common share (in dollars per share)	$ (0.94)		$ (0.09)		$ 0.06		$ 0.21		$ 0.24		$ (0.16)		$ (0.35)		$ (0.02)		$ (0.77)	$ (0.29)	$ 0.26

[1] The Company's quarterly results are significantly affected by the amounts recorded for professional liability expense, as discussed further in Note 9, "Commitments and Contingencies". The amount of expense recorded for professional liability in each quarter of 2017 is set forth in the table above.

[2] The Company's quarterly results are significantly affected by the amounts recorded for professional liability expense, as discussed further in Note 9, "Commitments and Contingencies". The amount of expense recorded for professional liability in each quarter of 2016 is set forth in the table above.