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Significant Accounting Policies - Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of allowance for doubtful accounts        
Beginning allowance for doubtful accounts $ 9,981 $ 8,733 $ 10,024 $ 8,835
Additions charged to expense 3,865 2,293 11,069 9,315
Write-offs, net of recoveries (4,052) (1,250) (11,299) (8,374)
Ending allowance for doubtful accounts $ 9,794 $ 9,776 $ 9,794 $ 9,776