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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from (used for) operating activities:    
Net income $ 7,629 $ 7,699
Adjustments to reconcile net income to net cash from (used for) operating activities -    
Depreciation and amortization 4,357 4,766
Loss on disposition of property and equipment 7 7
Stock-based compensation 1,024 656
Other long-term assets 207 (335)
Other long-term liabilities (151) (1,406)
13,073 11,387
Changes in working capital:    
Accounts receivable (42,076) (38,379)
Inventories (43,717) (8,664)
Prepaid expenses and other 2,616 2,075
Accounts payable 34,029 6,771
Change in outstanding checks (5,545) 982
Accrued payroll and other accrued liabilities (1,835) 136
(56,528) (37,079)
Net cash used for operating activities (43,455) (25,692)
Cash flows from (used for) investing activities:    
Capital expenditures (7,743) (2,066)
Proceeds from disposition of property and equipment 50 84
Net cash used for investing activities (7,693) (1,982)
Cash flows from (used for) financing activities:    
Credit facility revolver borrowings 129,549 105,463
Credit facility revolver repayments (76,829) (77,091)
Industrial revenue bond repayments (930)
Credit facility fees and expenses (19)
Proceeds from exercise of stock options (including tax benefit) 10
Dividends paid (220) (219)
Net cash from financing activities 51,551 28,163
Net change 403 489
Beginning balance 3,009 2,315
Ending balance 3,412 2,804
Interest paid 1,841 1,365
Income taxes paid $ 52 $ 26