ACQUISITIONS Critical Homecare Solutions Holdings, Inc. (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								11 Months Ended	12 Months Ended		11 Months Ended					0 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 1997	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010 Critical Homecare Solutions Holdings, Inc. [Member]	Mar. 25, 2010 Critical Homecare Solutions Holdings, Inc. [Member] state Nursing_Location	Mar. 25, 2010 Critical Homecare Solutions Holdings, Inc. [Member] Treatment_Center	Mar. 25, 2010 Critical Homecare Solutions Holdings, Inc. [Member] infusion_pharmacy	Mar. 25, 2010 Trademarks and Tradenames [Member] Critical Homecare Solutions Holdings, Inc. [Member]	Mar. 25, 2010 Customer Relationships [Member] Critical Homecare Solutions Holdings, Inc. [Member]	Mar. 25, 2010 certificates of need [Member] Critical Homecare Solutions Holdings, Inc. [Member]	Mar. 25, 2010 Common Stock [Member] Critical Homecare Solutions Holdings, Inc. [Member]	Mar. 25, 2010 Warrant [Member] Critical Homecare Solutions Holdings, Inc. [Member]	Mar. 25, 2010 Rollover Option [Member] Critical Homecare Solutions Holdings, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned																			$ 91,614	$ 12,268	$ 2,802
Business Acquisition, Cost of Acquired Entity, Cash Paid to Acquiree Sharesholders															99,626
Number of locations													33	16	35
Number of States in which Entity Operates													22	22	22
Acquired Finite-lived Intangible Asset, Amount															25,200	8,400	7,200	9,600
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life																	3 years
Business Combination, Consideration Transferred															206,310
Business Combination, Cost of Acquired Entity, Cash Paid to Reimburse Acquiree Transaction Expenses															14,566
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred															128,952
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents															7,162
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables															38,289
Business Acquisition, Purchase Price Allocation, Deferred Tax Assets															6,228
Business Acquisition, Purchase Price Allocation, Current Assets, Prepaid Expense and Other Assets															4,993
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment															6,462
Business Acquisition, Purchase Price Allocation, Other Noncurrent Assets															2,778
Business Acquisition, Purchase Price Allocation, Tangible Assets															65,912
Business Acquisition, Purchase Price Allocation, Current Liabilities, Accounts Payable															(3,334)
Business Acquisition, Purchase Price Allocation, Notes Payable and Long-term Debt															(2,250)
Business Acquisition, Purchase Price Allocation, Current Liabilities, Other Liabilities															(8,763)
Business Acquisition, Purchase Price Allocation, Current Liabilities, Accrued Liabilities															(34,002)
Business Acquisition, Purchase Price Allocation, Deferred Tax Liabilities, Noncurrent															(7,144)
Business Acquisition, Purchase Price Allocation, Liabilities Assumed															(55,493)
Business Acquisition, Purchase Price Allocation, Net Tangible Assets															10,419
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill															25,200
Business Acquisition, Purchase Price Allocation, Noncurrent Liabilities, Long-term Debt															(128,952)
Business Acquisition, Purchase Price Allocation, Goodwill Amount															299,643
Business Acquisition, Purchase Price Allocation, Goodwill Amount															21,100
Business Acquisition, Cost of Acquired Entity, Cash Paid															349,828
Health Care Organization, Revenue	180,738	170,365	155,633	158,264	133,830	131,575	130,837	155,901	430,707	662,637	554,506	207,200
Gross Profit	60,393	58,004	53,522	58,598	53,635	51,830	51,352	53,041	160,536	224,960	215,415	95,600
Operating Income (Loss)									7,539	13,288	25,553	27,100
Business Combination, Acquisition Related Costs									$ 5,924	$ 4,046	$ 0	$ 6,400