Property and Equipment (Components Of Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 156,901	$ 160,664
Less: Accumulated depreciation	(102,224)	(98,740)
Property and equipment, net	54,677	61,924
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	78,614	78,932
Computer Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	30,867	33,710
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	25,472	25,041
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,571	12,621
Furniture
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,618	8,601
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,759	$ 1,759
Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	1 year
Minimum [Member] | Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	1 year
Minimum [Member] | Computer Software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	1 year
Minimum [Member] | Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	10 years
Minimum [Member] | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	1 year
Minimum [Member] | Furniture
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	1 year
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	40 years
Maximum [Member] | Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	10 years
Maximum [Member] | Computer Software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	5 years
Maximum [Member] | Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	40 years
Maximum [Member] | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	15 years
Maximum [Member] | Furniture
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives (years)	13 years