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Debt - Aggregate contractual future principal payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
[1]
Debt Disclosure [Abstract]  
2019 $ 0
2020 0
2021 0
2022 0
2023 0
Thereafter 670,000
Long-term Debt $ 670,000
[1] Principal payments included relate to our term loan facility and senior notes. See Note 11—Commitment and Contingencies for future payments related to capital lease obligations.