Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Roll Forward of Receivable Allowance (Details)

v3.7.0.1
Summary of Significant Accounting Policies - Roll Forward of Receivable Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance Beginning of Year $ 2,762 $ 2,120 $ 1,937
Charged to Expense 10,785 9,735 8,149
Write-Offs and Other (10,504) (9,093) (7,966)
Balance End of Year $ 3,043 $ 2,762 $ 2,120