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Summary of Significant Accounting Policies - Estimated Amortization Expense for Contract Fulfillment Costs (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
2019	$ 21,227
2020	12,526
2021	$ 5,278

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- Definition

Capitalized Contract Cost, Amortization Expense, Next Twelve Months

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- Definition

Capitalized Contract Cost, Amortization Expense, Year Three

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- Definition

Capitalized Contract Cost, Amortization Expense, Year Two

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