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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating Activities    
Net income $ 39,632 $ 34,785
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 16,240 14,683
Amortization of deferred financing fees 334 334
Deferred income taxes 8,698 9,281
Stock-based compensation 4,924 3,958
Gain on sale of assets (206) (892)
Other (7,405) (7,946)
Working capital changes:    
Affiliates receivable/payable 1,903 6,771
Accounts receivable 8,221 (3,008)
Inventories (9,256) (1,193)
Other current assets 1,432 (508)
Accounts payable (388) 60
Income taxes receivable/payable (5,447) (2,478)
Other current liabilities (5,898) 775
Net cash provided by operating activities 52,784 54,622
Investing Activities    
Expenditures for property, plant and equipment (24,664) (20,930)
Proceeds from the sale of assets 4,572 1,454
Other (170) 1,089
Net cash used for investing activities (20,262) (18,387)
Financing Activities    
Net additions (reductions) to revolving credit agreement 12,000 (46,000)
Additions to long-term debt 2,000 396
Reductions to long-term debt (742) (1,125)
Cash dividends paid (5,132) (4,578)
Purchase of treasury shares (3,010) (1,294)
Other (3) 23
Net cash provided by (used for) financing activities 5,113 (52,578)
Cash and Cash Equivalents    
Total increase (decrease) for the year 37,635 (16,343)
Balance at the beginning of the year 85,257 101,600
Balance at the end of the year 122,892 85,257
Unallocated Items    
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 246 349
Investing Activities    
Expenditures for property, plant and equipment $ (231) $ (884)