Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Measurements [Abstract]

Summary Of Financial Assets And Liabilities Measured At Fair Value On Recurring Basis

			Fair Value Measurements at Reporting Date Using
	December 31, 2016		Level 1		Level 2		Level 3
Intangible and other long-term assets, net
Non-qualified deferred compensation assets	$	12,360	$	368	$	11,992		-
Interest rate swaps	$	8,579		-	$	8,579		-
Accounts payable
Non-qualified deferred compensation liabilities	$	1,115		-	$	1,115		-
Other long-term liabilities
Non-qualified deferred compensation liabilities	$	18,489		-	$	18,489		-
	December 31, 2015		Level 1		Level 2		Level 3
Intangible and other long-term assets, net
Non-qualified deferred compensation assets	$	11,548	$	368	$	11,180		-
Interest rate swaps	$	6,905		-	$	6,905		-
Accounts payable
Non-qualified deferred compensation liabilities	$	721		-	$	721		-
Other long-term liabilities
Non-qualified deferred compensation liabilities	$	17,367		-	$	17,367		-

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]

	Years ended December 31,
	2016				2015
	Impairment		Fair Value		Impairment		Fair Value
Goodwill	$	330,500	$	668,864	$	1,326,701	$	998,288
Intangible assets	$	68,865	$	-	$	68,890	$	6,345
Property, plant and equipment, net	$	74,938	$	294,457	$	177,442	$	179,612