Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenue from external customers	$ 457,142		$ 470,575		$ 915,635		$ 936,883
Intersegment revenues	0		0		0		0
Total net revenues	457,142		470,575		915,635		936,883
Operating salaries and benefits	259,506		263,461		520,595		525,943
Self-insurance for workers' compensation and general and professional liability insurance	13,190		14,541		28,507		29,098
Other operating costs	95,429		92,159		191,995		183,294
General and Administrative Expense	27,751	[1]	28,257	[1]	56,199	[1]	56,703	[1]
Provision for losses on accounts receivable	5,099		4,418		9,908		9,595
Consolidated income before income taxes and discontinued operations	56,167		67,739		108,431		132,250
Center rent expense	36,522		35,750		72,899		71,442
Depreciation and amortization	8,504		7,629		16,934		15,077
Interest, net	4,429		4,854		8,839		9,853
Net segment income	6,712		19,506		9,759		35,878
Identifiable segment assets	735,104		1,095,915		735,104		1,095,915
Goodwill	34,905		350,408		34,905		350,408		34,496
Segment capital expenditures	7,868		9,319		17,829		18,156
Inpatient Services [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	405,135		418,584		810,923		832,471
Intersegment revenues	0		0		0		0
Total net revenues	405,135		418,584		810,923		832,471
Operating salaries and benefits	189,415		192,826		379,124		383,756
Self-insurance for workers' compensation and general and professional liability insurance	12,157		13,480		26,445		26,979
Other operating costs	123,820		120,844		249,488		240,268
General and Administrative Expense	8,841	[1]	10,264	[1]	18,101	[1]	20,277	[1]
Provision for losses on accounts receivable	4,614		4,025		9,044		8,979
Consolidated income before income taxes and discontinued operations	66,288		77,145		128,721		152,212
Center rent expense	36,207		35,453		72,282		70,845
Depreciation and amortization	7,115		6,354		14,144		12,560
Interest, net	(8)		(31)		(28)		(37)
Net segment income	22,974		35,369		42,323		68,844
Identifiable segment assets	392,959		701,565		392,959		701,565
Goodwill	30,297		345,800		30,297		345,800
Segment capital expenditures	7,363		7,869		16,020		14,376
Rehabiliation Therapy Services [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	29,197		29,979		59,826		60,077
Intersegment revenues	32,804		33,225		66,267		65,920
Total net revenues	62,001		63,204		126,093		125,997
Operating salaries and benefits	52,465		53,494		106,359		107,629
Self-insurance for workers' compensation and general and professional liability insurance	610		642		1,219		1,285
Other operating costs	2,364		2,540		4,861		4,708
General and Administrative Expense	2,240	[1]	2,431	[1]	4,770	[1]	4,829	[1]
Provision for losses on accounts receivable	366		316		781		640
Consolidated income before income taxes and discontinued operations	3,956		3,781		8,103		6,906
Center rent expense	145		127		279		254
Depreciation and amortization	260		227		511		453
Interest, net	0		0		0		0
Net segment income	3,551		3,427		7,313		6,199
Identifiable segment assets	17,884		16,490		17,884		16,490
Goodwill	75		75		75		75
Segment capital expenditures	152		224		562		953
Medical Staffing Services [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	22,804		21,998		44,873		44,314
Intersegment revenues	719		699		1,550		1,321
Total net revenues	23,523		22,697		46,423		45,635
Operating salaries and benefits	17,626		17,141		35,112		34,558
Self-insurance for workers' compensation and general and professional liability insurance	359		352		715		699
Other operating costs	2,768		2,699		5,463		5,559
General and Administrative Expense	621	[1]	609	[1]	1,236	[1]	1,264	[1]
Provision for losses on accounts receivable	119		77		83		(24)
Consolidated income before income taxes and discontinued operations	2,030		1,819		3,814		3,579
Center rent expense	170		170		338		343
Depreciation and amortization	187		187		371		374
Interest, net	(3)		0		(3)		1
Net segment income	1,676		1,462		3,108		2,861
Identifiable segment assets	20,073		19,571		20,073		19,571
Goodwill	4,533		4,533		4,533		4,533
Segment capital expenditures	60		19		112		72
Corporate [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	6		14		13		21
Intersegment revenues	0		0		0		0
Total net revenues	6		14		13		21
Operating salaries and benefits	0		0		0		0
Self-insurance for workers' compensation and general and professional liability insurance	64		67		128		135
Other operating costs	0		0		0		0
General and Administrative Expense	16,049	[1]	14,953	[1]	32,092	[1]	30,333	[1]
Provision for losses on accounts receivable	0		0		0		0
Consolidated income before income taxes and discontinued operations	(16,107)		(15,006)		(32,207)		(30,447)
Center rent expense	0		0		0		0
Depreciation and amortization	942		861		1,908		1,690
Interest, net	4,440		4,885		8,870		9,889
Net segment income	(21,489)		(20,752)		(42,985)		(42,026)
Identifiable segment assets	283,325		337,425		283,325		337,425
Goodwill	0		0		0		0
Segment capital expenditures	293		1,207		1,135		2,755
Intersegment, Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	0		0		0		0
Intersegment revenues	(33,523)		(33,924)		(67,817)		(67,241)
Total net revenues	(33,523)		(33,924)		(67,817)		(67,241)
Operating salaries and benefits	0		0		0		0
Self-insurance for workers' compensation and general and professional liability insurance	0		0		0		0
Other operating costs	(33,523)		(33,924)		(67,817)		(67,241)
General and Administrative Expense	0	[1]	0	[1]	0	[1]	0	[1]
Provision for losses on accounts receivable	0		0		0		0
Consolidated income before income taxes and discontinued operations	0		0		0		0
Center rent expense	0		0		0		0
Depreciation and amortization	0		0		0		0
Interest, net	0		0		0		0
Net segment income	0		0		0		0
Identifiable segment assets	20,863		20,864		20,863		20,864
Goodwill	0		0		0		0
Segment capital expenditures	$ 0		$ 0		$ 0		$ 0

[1] General and administrative expenses include operating administrative expenses.