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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from (used for) operating activities:    
Net income $ 2,074 $ 7,629
Adjustments to reconcile net income to net cash from (used for) operating activities -    
Depreciation and amortization 4,879 4,357
Loss on disposition of property and equipment 4 7
Stock-based compensation 1,498 1,024
Other long-term assets (791) 207
Other long-term liabilities (926) (151)
6,738 13,073
Changes in working capital:    
Accounts receivable (28,735) (42,076)
Inventories 26,448 (43,717)
Prepaid expenses and other (350) 2,616
Accounts payable 8,895 34,029
Change in outstanding checks (5,421) (5,545)
Accrued payroll and other accrued liabilities (8,740) (1,835)
(7,903) (56,528)
Net cash used for operating activities (1,165) (43,455)
Cash flows from (used for) investing activities:    
Acquisition (11,000)
Capital expenditures (2,399) (7,743)
Proceeds from disposition of property and equipment 5 50
Net cash used for investing activities (13,394) (7,693)
Cash flows from (used for) financing activities:    
Credit facility revolver borrowings 194,840 129,549
Credit facility revolver repayments (184,101) (76,829)
Principal payment under capital lease obligation (2)
Industrial revenue bond repayments (930)
Credit facility fees and expenses (100) (19)
Proceeds from exercise of stock options (including tax benefit)
Repurchase of common stock (64)
Dividends paid (220) (220)
Net cash from financing activities 10,353 51,551
Cash and cash equivalents:    
Net change (4,206) 403
Beginning balance 9,319 3,009
Ending balance 5,113 3,412
Interest paid 3,188 1,841
Income taxes paid $ 58 $ 52