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Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 169,627 $ 156,992
Less: Accumulated depreciation and amortization (77,327) (70,997)
Total property and equipment, net 92,300 85,995
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 903 903
Building [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 11,009 11,007
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 111,716 105,383
Capitalized Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 8,754 7,391
Office Furniture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 5,094 4,714
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 22,737 17,867
Useful Life (in years) [1] Life of lease (a)  
Rental Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 156 149
Useful Life (in years) 5 years  
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 9,258 $ 9,578
Minimum [Member] | Building [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life (in years) 25 years  
Minimum [Member] | Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life (in years) 2 years  
Minimum [Member] | Capitalized Software [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life (in years) 3 years  
Minimum [Member] | Office Furniture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life (in years) 1 year  
Maximum [Member] | Building [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life (in years) 30 years  
Maximum [Member] | Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life (in years) 7 years  
Maximum [Member] | Capitalized Software [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life (in years) 5 years  
Maximum [Member] | Office Furniture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life (in years) 5 years  
[1] Leasehold improvements are amortized on a straight-line basis over the shorter of (i) their estimated useful lives and (ii) the estimated or contractual life of the related lease.