Annual report pursuant to Section 13 and 15(d)

Accounts Receivable and Other Current Assets - Accounts Receivable (Details)

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Accounts Receivable and Other Current Assets - Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 76,510 $ 67,208
Allowance for doubtful accounts 2,318 2,363
Accounts receivable, net 74,192 64,845
Trade receivables from customers    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross 66,839 59,444
Insurance commissions receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 9,671 $ 7,764