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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 23,220 $ 3,822
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 22,819 23,592
Amortization and write-off of debt issuance costs and debt discount 1,149 2,435
Deferred income taxes 1,497 40
Bad debt expense 443 681
Stock compensation expense 2,890 2,904
Net loss (gain) on sale of assets and asset impairments (245) 3,145
Changes in assets and liabilities:    
Receivables (57,575) (41,655)
Inventories (85,958) (76,243)
Other current assets (9,481) (6,118)
Other assets and liabilities 1,552 348
Accounts payable and checks outstanding 4,376 50,949
Accrued liabilities (83,012) (100,342)
Net cash used in operating activities (178,325) (136,442)
Cash flows from investing activities:    
Purchases of property, plant and equipment (20,113) (9,778)
Proceeds from sale of property, plant and equipment 568 449
Net cash used in investing activities (19,545) (9,329)
Cash flows from financing activities:    
Borrowings under revolving credit facility 555,000 457,000
Repayments under revolving credit facility (399,000) (315,000)
Repayments of long-term debt and other loans (2,780) (2,626)
Payments of loan costs   (2,765)
Exercise of stock options 2,041 1,701
Repurchase of common stock (4,855) (2,473)
Net cash provided by financing activities 150,406 135,837
Net change in cash and cash equivalents (47,464) (9,934)
Cash and cash equivalents at beginning of period 57,533 14,449
Cash and cash equivalents at end of period $ 10,069 $ 4,515