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Commitments And Contingencies (Minimum Payments Required Under Purchase Obligations) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Purchase Obligations And Contractual Agreements [Line Items]  
2017 $ 1,404,626
2018 96,956
2019 92,869
2020 92,675
2021 87,364
Thereafter 2,030,938
Purchase Obligation 3,805,428
Purchase Obligations [Member]  
Purchase Obligations And Contractual Agreements [Line Items]  
2017 33,175
2018 4,893
2019 806
2020 612
2021 301
Thereafter 0
Purchase Obligation 39,787
.TV Agreement [Member]  
Purchase Obligations And Contractual Agreements [Line Items]  
2017 5,000
2018 5,000
2019 5,000
2020 5,000
2021 0
Thereafter 0
Purchase Obligation 20,000
Convertible Debt [Member]  
Purchase Obligations And Contractual Agreements [Line Items]  
2017 1,279,388
2018 0
2019 0
2020 0
2021 0
Thereafter 0
Purchase Obligation 1,279,388
Senior Notes [Member]  
Purchase Obligations And Contractual Agreements [Line Items]  
2017 87,063
2018 87,063
2019 87,063
2020 87,063
2021 87,063
Thereafter 2,030,938
Purchase Obligation $ 2,466,253