Equity Method Investments (Tables)

12 Months Ended

Dec. 31, 2017

Equity Method Investments and Joint Ventures [Abstract]

Schedule of equity method investments

As of December 31, 2016 and 2017, these businesses consist primarily of the following ownership interests:

BIR JV, LLP	49.0	%
OHRH, LLC	49.0	%
GlobalRehab—Scottsdale, LLC	49.0	%
Rehabilitation Institute of Denton, LLC	50.0	%
ES Rehabilitation, LLC	49.0	%
Coastal Virginia Rehabilitation, LLC	49.0	%

Summarized combined financial information of the rehabilitation entities in which the Company has a minority ownership interest is as follows:

	December 31,
	2016		2017
	(in thousands)
Current assets	$	90,656	$	102,908
Non-current assets	78,913		79,364
Total assets	$	169,569	$	182,272
Current liabilities	$	32,520	$	37,113
Non-current liabilities	14,384		13,751
Equity	122,665		131,408
Total liabilities and equity	$	169,569	$	182,272

	December 31,
	2015		2016		2017
	(in thousands)
Revenues	$	289,994	$	320,078	$	336,349
Operating expenses	250,170		274,952		289,224
Net income	37,951		43,410		45,648