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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash Flows from Operating Activities      
Net income $ 38,793 $ 37,284 $ 41,823
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 11,572 11,362 11,308
Gain on sale of equity method investment 0 0 (11,381)
Share-based compensation 3,304 3,099 2,574
Equity method investment loss 0 0 348
Distributions received from equity method investee 0 0 7,131
Deferred income taxes, including change in valuation allowance 252 1,665 (3,420)
Other, net (116) 0 61
Changes in operating assets and liabilities:      
Receivables, net (2,134) (4,450) (8,262)
Inventory (28,162) (15,620) (14,291)
Prepaid expenses (728) 862 (498)
Refundable income taxes (275) 1,268 725
Accounts payable 2,107 (2,542) 9,540
Accounts payable to affiliate, net 0 0 (3,349)
Accrued expenses (4,547) 551 2,278
Deferred credits (332) (586) (827)
Other, net (12) 588 (289)
Net cash provided by operating activities 19,722 33,481 33,471
Cash Flows from Investing Activities      
Additions to property, plant, and equipment (16,730) (31,046) (21,055)
Divestiture of equity method investment, net 0 0 22,832
Deferred compensation plan investments (1,201) 0 0
Net cash provided by (used in) investing activities (17,931) (31,046) 1,777
Cash Flows from Financing Activities      
Payment of dividends and dividend equivalents (6,856) (5,500) (17,380)
Purchase of treasury stock for tax withholding on equity-based compensation (5,489) (2,324) (4,663)
Loan fees incurred with borrowings 0 0 (377)
Proceeds from long-term debt 20,000 0 20,000
Principal payments on long-term debt (386) (372) (358)
Proceeds from credit agreement - revolver 17,440 28,966 25,930
Payments on credit agreement - revolver (28,140) (21,264) (56,885)
Other, net (76) 0 0
Net cash used in financing activities (3,507) (494) (33,733)
Increase (decrease) in cash and cash equivalents (1,716) 1,941 1,515
Cash and cash equivalents, beginning of year 5,025 3,084 1,569
Cash and cash equivalents, end of year $ 3,309 $ 5,025 $ 3,084