Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net operating revenues	$ 1,296,210	$ 1,102,465	$ 2,549,174	$ 2,193,982
Costs and expenses:
Cost of services	1,094,731	920,194	2,160,544	1,849,332
General and administrative	29,194	28,275	60,976	56,350
Depreciation and amortization	51,724	38,333	98,495	80,872
Total costs and expenses	1,175,649	986,802	2,320,015	1,986,554
Income (loss) from operations	120,561	115,663	229,159	207,428
Other income and expense:
Loss on early retirement of debt			(10,255)	(19,719)
Equity in earnings of unconsolidated subsidiaries	4,785	5,666	9,482	11,187
Non-operating gain	6,478	0	6,877	(49)
Interest expense	(50,159)	(37,655)	(97,322)	(78,508)
Income before income taxes	81,665	83,674	137,941	120,339
Income tax expense	21,106	32,374	33,400	45,576
Net income	60,559	51,300	104,541	74,763
Less: Net income attributable to non-controlling interests	14,048	9,245	24,291	16,838
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation	$ 46,511	$ 42,055	$ 80,250	$ 57,925
Income per common share:
Basic (in dollars per share)	$ 0.35	$ 0.32	$ 0.60	$ 0.44
Diluted (in dollars per share)	$ 0.35	$ 0.32	$ 0.60	$ 0.44
Weighted average shares outstanding:
Basic (in shares)	129,830	128,624	129,761	128,544
Diluted (in shares)	129,924	128,777	129,871	128,703
Select Medical Corporation
Net operating revenues	$ 1,296,210	$ 1,102,465	$ 2,549,174	$ 2,193,982
Costs and expenses:
Cost of services	1,094,731	920,194	2,160,544	1,849,332
General and administrative	29,194	28,275	60,976	56,350
Depreciation and amortization	51,724	38,333	98,495	80,872
Total costs and expenses	1,175,649	986,802	2,320,015	1,986,554
Income (loss) from operations	120,561	115,663	229,159	207,428
Other income and expense:
Loss on early retirement of debt			(10,255)	(19,719)
Equity in earnings of unconsolidated subsidiaries	4,785	5,666	9,482	11,187
Non-operating gain	6,478	0	6,877	(49)
Interest expense	(50,159)	(37,655)	(97,322)	(78,508)
Income before income taxes	81,665	83,674	137,941	120,339
Income tax expense	21,106	32,374	33,400	45,576
Net income	60,559	51,300	104,541	74,763
Less: Net income attributable to non-controlling interests	14,048	9,245	24,291	16,838
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation	$ 46,511	$ 42,055	$ 80,250	$ 57,925