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Commitments and Contingencies - State and Local Taxes and Surcharges (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2014
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]                        
General and administrative expense   $ 6,511 $ 6,143 $ 5,882 $ 6,536 $ 6,433 $ 6,087 $ 6,027 $ 7,275 $ 25,072 $ 25,822 $ 24,416
Sales tax liability, current   1,347       1,262       1,347 1,262  
Sales tax liability — less current portion   1,476       1,915       1,476 1,915  
Contingent sales tax liabilities                        
Loss Contingencies [Line Items]                        
Payments for state and local taxes on usage-based fees                   300    
Sales tax liability, (gain) expense                   (400) 1,200 $ 1,100
Sales tax liability, current   600               600    
Sales tax liability — less current portion   1,500               1,500    
Potential Obligation for State Taxes on Usage Based Fees                        
Loss Contingencies [Line Items]                        
Sales tax liability — less current portion   $ 2,100       $ 2,700       $ 2,100 $ 2,700  
Out of Period Adjustment | Contingent sales tax liabilities                        
Loss Contingencies [Line Items]                        
General and administrative expense                 $ 600      
Period 2011 to Q1 2014 | Reversal of sales tax liability | Potential Obligation for State Taxes on Usage Based Fees                        
Loss Contingencies [Line Items]                        
Reversal of sales tax liability $ 2,800                      
Period 2011 to 2013 | Reversal of sales tax liability | Potential Obligation for State Taxes on Usage Based Fees                        
Loss Contingencies [Line Items]                        
Reversal of sales tax liability $ 2,500