- Fair Value Measurements (Schedule of Financial Assets Measured At Fair Value On A Nonrecurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Assets:
Total expense for the year	$ (88,438)	$ (22,767)	$ (253,886)	$ (471,183)
Fair value, measurements, nonrecurring
Assets:
Total expense for the year			(102,778)
Fair value, measurements, nonrecurring | Intangible assets
Assets:
Total expense for the year			(100,399)
Fair value, measurements, nonrecurring | Certain property, plant and equipment
Assets:
Total expense for the year			(2,379)
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