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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash Flows from Operating Activities    
Net income $ 25,462 $ 29,184
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,529 8,441
Distributions received from equity method investee 0 7,131
Deferred income taxes 924 356
Share-based compensation 2,464 2,130
Gain on sale of equity method investment 0 (11,381)
Equity method investment loss 0 348
Changes in operating assets and liabilities:    
Receivables, net (15,644) (11,366)
Inventory (14,197) (10,794)
Prepaid expenses 297 (824)
Accounts payable (3,453) 4,193
Accounts payable to affiliate, net 0 (3,349)
Accrued expenses (2,623) 790
Income taxes payable/refundable (31) 2,472
Deferred credit (464) (617)
Accrued retirement health and life insurance benefits 395 (267)
Net cash provided by operating activities 1,659 16,447
Cash Flows from Investing Activities    
Additions to plant, property and equipment (18,870) (13,630)
Return of equity method investment 0 22,832
Proceeds from property insurance recoveries 0 14
Net cash provided by (used in) investing activities (18,870) 9,216
Cash Flows from Financing Activities    
Purchase of treasury stock for tax withholding on equity-based compensation (2,215) (1,377)
Payment of dividends and dividend equivalents (4,125) (16,692)
Proceeds on long-term debt 0 20,000
Principal payments on long-term debt (279) (268)
Proceeds from credit agreement - revolver 22,766 20,580
Payments on credit agreement - revolver (2,020) (41,985)
Loan fees incurred with borrowings 0 377
Net cash provided by (used in) financing activities 14,127 (20,119)
Increase (decrease) in cash and cash equivalents (3,084) 5,544
Cash and cash equivalents, beginning of period 3,084 1,569
Cash and cash equivalents, end of period $ 0 $ 7,113