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Condensed consolidated statements of cash flows (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 1,938 $ 6,130
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 8,712 7,147
Stock-based compensation expense 8,271 5,933
Amortization of debt issuance costs and discount on debt 398 403
Deferred income taxes 1,409 (2,682)
Other, net 175 364
Changes in operating assets and liabilities:    
Accounts receivable 16,912 11,486
Inventories 2,818 (2,861)
Prepaid expenses and other assets (5,464) (3,507)
Accounts payable and accrued expenses (18,942) (40,328)
Other liabilities 144 52
Net cash provided by (used in) operating activities 16,371 (17,863)
Cash flows from investing activities:    
Purchase of property and equipment (5,162) (2,149)
Investment in equity securities 0 (2,875)
Net cash used in investing activities (5,162) (5,024)
Cash flows from financing activities:    
Proceeds from revolving line of credit 2,000 20,600
Repayment of revolving line of credit (2,000) (6,500)
Repayment of long term debt (4,125) (4,125)
Cash received from issuance of common stock 497 1,153
Other, net (195) (182)
Net cash provided by (used in) financing activities (3,823) 10,946
Net increase (decrease) in cash 7,386 (11,941)
Cash - beginning of period 10,059 15,295
Cash - end of period $ 17,445 $ 3,354