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Significant Accounting Policies (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Schedule of allowance for doubtful accounts    
Allowance for doubtful accounts, beginning of period $ 10,024 $ 8,835
Additions charged to expense 3,068 3,470
Write-offs, net of recoveries (2,866) (3,617)
Allowance for doubtful accounts, end of period $ 10,226 $ 8,688