Commitments and Contingencies (Streaming Content) (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Contractual Obligation [Line Items]
Total streaming content obligations	$ 19,285,875	$ 17,694,642
Current content liabilities	4,686,019	4,173,041
Non-current content liabilities	3,759,026	3,329,796
Unrecorded streaming obligations	10,800,000	10,200,000
Current Content Liabilities
Contractual Obligation [Line Items]
Current content liabilities	4,700,000	4,200,000
Non-current Content Liabilities
Contractual Obligation [Line Items]
Non-current content liabilities	$ 3,800,000	$ 3,300,000