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Significant Accounting Policies (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of allowance for doubtful accounts        
Allowance for doubtful accounts, beginning of period $ 8,688 $ 10,842 $ 8,835 $ 10,303
Additions charged to expense 3,553 3,610 7,022 8,603
Write-offs, net of recoveries (3,508) (5,308) (7,124) (9,762)
Allowance for doubtful accounts, end of period $ 8,733 $ 9,144 $ 8,733 $ 9,144