- Fair Value Measurements (Schedule of Financial Assets Measured At Fair Value On A Nonrecurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Assets:
Total expense for the year	$ (4,766)	$ (142,217)	$ (258,652)	$ (613,400)
Fair value, measurements, nonrecurring
Assets:
Total expense for the year			(107,544)
Fair value, measurements, nonrecurring | Intangible assets
Assets:
Total expense for the year			(104,660)
Fair value, measurements, nonrecurring | Certain property, plant and equipment
Assets:
Total expense for the year			(2,884)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value, measurements, nonrecurring
Assets:
Intangible assets, excluding goodwill	0		0
Certain property, plant and equipment	0		0
Total	0		0
Significant Other Observable Inputs (Level 2) | Fair value, measurements, nonrecurring
Assets:
Intangible assets, excluding goodwill	0		0
Certain property, plant and equipment	0		0
Total	0		0
Significant Unobservable Inputs (Level 3) | Fair value, measurements, nonrecurring
Assets:
Intangible assets, excluding goodwill	41,839		41,839
Certain property, plant and equipment	0		0
Total	$ 41,839		$ 41,839