Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Expected Subscriber Fees (Details)

v3.7.0.1
Summary of Significant Accounting Policies - Expected Subscriber Fees (Details) - Subscriber Accounts
$ in Thousands
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2017 $ 215,369
2018 181,708
2019 153,417
2020 134,817
2021 $ 120,391