Property And Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2017

Property And Equipment, Net [Abstract]

Schedule Of Estimated Useful Lives For Property And Equipment

Asset Classification	Estimated Useful Life
Land improvements	15 to 20 years
Buildings and improvements	10 to 40 years
Leasehold improvements	Shorter of remaining lease term or useful life of improvements
Machinery and equipment	3 to 8 years
Office furniture and equipment	3 to 7 years
Computer hardware and software	3 to 7 years

Schedule Of Property And Equipment

	December 31,		December 31,
		2017		2016
Land and improvements	$	7,323	$	7,255
Buildings and improvements		180,185		171,455
Leasehold improvements		52,227		44,568
Machinery and equipment		284,375		262,718
Office furniture and equipment		47,476		42,124
Computer hardware and software		206,580		189,327
Construction in progress		33,470		25,145
		811,636		742,592
Less accumulated depreciation and amortization		432,540		385,170
Total property and equipment, net	$	379,096	$	357,422

Summary Of Depreciation And Amortization, Capitalized Computer Software For Internal Use And Unpaid Property Equipment Reflected In Account Payable And Accrued Expenses

	December 31,		December 31,		December 31,
		2017		2016		2015
Depreciation and amortization expense	$	73,797	$	63,537	$	57,029
Capitalized computer software developed for internal use		16,131		15,590		19,081
Unpaid property and equipment, reflected in accounts payable and accrued liabilities		11,744		10,601		8,534