Fixed Assets (Schedule of Fixed Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 559,234	$ 424,056
Less accumulated depreciation and amortization	236,358	195,106
Fixed assets, net	322,876	228,950
Land
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	22,962	19,176
Buildings and improvements
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	159,805	118,555
Leasehold improvements
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	16,132	12,707
Machinery and equipment
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	251,995	201,081
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	51,893	39,047
Construction in progress
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 56,447	$ 33,490
Minimum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life in years	10 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life in years	3 years
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life in years	3 years
Minimum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life in years	3 years
Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life in years	40 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life in years	10 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life in years	15 years
Maximum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life in years	8 years