Property and Equipment (Components Of Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 212,739	$ 183,201
Less: Accumulated depreciation	(129,103)	(121,546)
Property and equipment, net	83,636	61,655
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	105,428	92,409
Computer Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	33,878	35,053
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	38,095	27,352
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	19,876	15,782
Furniture
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,766	10,846
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,696	$ 1,759
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	1 year
Minimum | Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	1 year
Minimum | Computer Software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	1 year
Minimum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	5 years
Minimum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	1 year
Minimum | Furniture
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	1 year
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	40 years
Maximum | Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	15 years
Maximum | Computer Software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	5 years
Maximum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	40 years
Maximum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	17 years
Maximum | Furniture
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	13 years