Commitments and Contingencies (Expected Timing of Payments for Commitments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Less than one year	$ 7,446,947	$ 6,200,611
Due after one year and through 3 years	8,210,159	6,731,336
Due after 3 years and through 5 years	1,894,001	1,386,934
Due after 5 years	143,535	160,606
Total streaming content obligations	$ 17,694,642	$ 14,479,487