Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies- Accounts Receivable (Details)

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Summary of Significant Accounting Policies- Accounts Receivable (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Changes in the Allowance for Doubtful Accounts [Roll Forward]    
Allowance for doubtful accounts, beginning of period $ 2,851 $ 1,519
Charges to costs and expenses 83 266
Account write-offs and other (256) (199)
Allowance for doubtful accounts, end of period $ 2,678 $ 1,586
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable Retainage 5.00%  
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable Retainage 10.00%