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Acquisitions (Details)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 15 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Sep. 30, 2011
USD ($)
Jun. 30, 2011
USD ($)
Mar. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Sep. 30, 2010
USD ($)
Jun. 30, 2010
USD ($)
Mar. 31, 2010
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2011
GOFA [Member]
USD ($)
Dec. 31, 2011
GOFA [Member]
EUR (€)
Dec. 31, 2011
Clever Fellows Innovation Consortium [Member]
USD ($)
Apr. 02, 2011
Clever Fellows Innovation Consortium [Member]
USD ($)
Dec. 31, 2011
SeQual Technologies, Inc. [Member]
USD ($)
Aug. 31, 2011
Cryotech International, Inc. [Member]
USD ($)
Dec. 31, 2011
Cryotech International, Inc. [Member]
USD ($)
Jun. 30, 2011
Covidien Japn Inc. - Liquid Oxygen Therapy Business [Member]
USD ($)
Dec. 31, 2010
Covidien Japn Inc. - Liquid Oxygen Therapy Business [Member]
USD ($)
Dec. 31, 2011
BioMedical [Member]
Clever Fellows Innovation Consortium [Member]
USD ($)
Dec. 31, 2011
BioMedical [Member]
SeQual Technologies, Inc. [Member]
USD ($)
Dec. 31, 2011
BioMedical [Member]
Cryotech International, Inc. [Member]
USD ($)
Dec. 31, 2011
Selling, General and Administrative Expense [Member]
Clever Fellows Innovation Consortium [Member]
USD ($)
Dec. 31, 2011
Selling, General and Administrative Expense [Member]
SeQual Technologies, Inc. [Member]
USD ($)
Net assets acquired:                                                  
Cash                       $ 1,974       $ 218                  
Accounts receivable                       4,645       6,169                  
Inventory                       8,382       4,959                  
Property and equipment                       15,555       711                  
Other assets                       118       184                  
Intangible assets                       7,258       31,760                  
Goodwill                       11,438   2,938   7,210   4,227              
Liabilities assumed                       (9,560)       (7,799)                  
Total purchase price                       39,810       43,412                  
Business combination equity interest percentage                       100.00% 100.00% 100.00%                      
Acquisition of businesses, net of cash acquired                 37,680 47,865 18,086   26,261                        
Working capital adjustment                         947                        
Potential purchase price in cash                           5,000   60,000   6,653              
Cash paid for acquisition                           2,000   38,312   4,053   1,008          
Sales 219,635 211,311 200,698 162,941 158,838 139,205 139,144 118,268 794,585 555,455 597,458                   840 35,081 11,928    
Duration of payments for contingent consideration                           3 years   2 years   2 years              
Contingent consideration at acquisition                           1,857 1,650 4,369   841              
Increase (decrease) in fair value of the contingent consideration                                   341           207 731
Fair value of net assets acquired                       28,372   732       1,626   2,132          
Contingent consideration payment                                 1,300                
Gain on acquisition of business             1,124   0 1,124 6,954               1,124            
Net income $ 8,316 $ 17,505 $ 11,020 $ 7,403 $ 9,963 $ 6,665 $ 2,458 $ 1,419 $ 44,244 $ 20,505 $ 61,156 $ 572                     $ 842