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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from (used for) operating activities:    
Net income $ 12,496 $ 2,783
Adjustments to reconcile net income to net cash from (used for) operating activities -    
Depreciation and amortization 9,537 9,961
(Gain) loss on disposition of property and equipment 6 (160)
Stock-based compensation 804 224
Other long-term assets (760) (4,496)
Other long-term liabilities (672) 5,116
21,411 13,428
Changes in working capital:    
Accounts receivable (56,300) (20,523)
Inventories (8,214) (4,139)
Prepaid expenses and other (90) 640
Accounts payable 4,935 19,482
Change in outstanding checks (559) (3,937)
Accrued payroll and other accrued liabilities 334 5,582
(59,894) (2,895)
Net cash from (used for) operating activities (38,483) 10,533
Cash flows from (used for) investing activities:    
Capital expenditures (4,469) (3,597)
Proceeds from disposition of property and equipment 85 160
Net cash used for investing activities (4,384) (3,437)
Cash flows from (used for) financing activities:    
Credit facility revolver borrowings 221,374 128,183
Credit facility revolver repayments (175,246) (131,499)
Industrial revenue bond repayments (895) (865)
Credit facility fees and expenses (125) (125)
Proceeds from exercise of stock options (including tax benefits) and employee stock purchases 9 34
Dividends paid (439) (438)
Net cash from (used for) financing activities 44,678 (4,710)
Net change 1,811 2,386
Beginning balance 2,315 1,604
Ending balance 4,126 3,990
Interest paid 2,955 2,133
Income taxes paid $ 4,944 $ 115