Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Recently Adopted Accounting Policies (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Recently Adopted Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Activation fee revenue recognition period 1 month    
Accumulated deficit $ (2,057,309) $ (3,233,202) $ (3,243,473)
Accumulated other comprehensive (loss) income, net of tax $ (6,193) 22,420 $ 18,407
Adjustments Due to ASU 2018-02      
Disaggregation of Revenue [Line Items]      
Accumulated deficit   (4,013)  
Accumulated other comprehensive (loss) income, net of tax   4,013  
Impact of Adopting ASU 2014-09 | Adjustments Due to ASU 2014-09      
Disaggregation of Revenue [Line Items]      
Accumulated deficit   18,416  
Accumulated other comprehensive (loss) income, net of tax   0  
Impact of Adopting ASU 2014-09 | Adjustments Due to ASU 2014-09 | Activation Fees      
Disaggregation of Revenue [Line Items]      
Reduction in deferred revenue   8,260  
Accumulated deficit   8,260  
Impact of Adopting ASU 2014-09 | Adjustments Due to ASU 2014-09 | Loyalty Payments      
Disaggregation of Revenue [Line Items]      
Accumulated deficit   10,156  
Prepaid Expense and Other Assets   $ 10,156