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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows from Operating Activities      
Net earnings $ 89,600,000 $ 126,256,000 $ 106,785,000
Adjustments to arrive at net cash provided by operating activities:      
Depreciation and amortization 48,518,000 47,019,000 47,939,000
Share-based compensation 5,855,000 7,709,000 1,598,000
Net loss on assets 2,552,000 9,755,000 13,190,000
Loss on divestiture of business 33,160,000 0 0
Liquidation of foreign entity 0 (3,257,000) 0
Deferred income taxes 17,414,000 10,428,000 (4,452,000)
Changes in operating assets and liabilities:      
Trade accounts receivable 10,630,000 31,144,000 (21,721,000)
Inventories (47,345,000) (20,064,000) 3,041,000
Prepaid expenses and other assets 16,806,000 (671,000) 2,698,000
Accounts payable and other accrued expenses 4,804,000 2,332,000 (8,792,000)
Accrued salaries, wages and withholdings from employees (4,361,000) 3,347,000 (2,851,000)
Income taxes 2,846,000 5,959,000 (5,520,000)
Other liabilities 27,000 2,521,000 (3,868,000)
Net cash provided by operating activities 180,506,000 222,478,000 128,047,000
Cash flows from investing activities:      
Acquisition of property, plant and equipment (56,344,000) (81,216,000) (79,941,000)
Proceeds from sale of assets 10,485,000 6,254,000 12,912,000
Proceeds from divesture of business 12,457,000 0 0
Acquisition of new business 0 0 (8,393,000)
Other investing activities (415,000) (241,000) (372,000)
Net cash used in investing activities (33,817,000) (75,203,000) (75,794,000)
Cash Flows from Financing Activities      
Proceeds from additional borrowings 231,174,000 222,562,000 331,277,000
Debt payments (239,950,000) (247,092,000) (156,662,000)
Purchase of treasury stock (87,217,000) (50,100,000) (176,566,000)
Dividends paid (54,038,000) (49,635,000) (48,110,000)
Other financing activities (3,383,000) (3,706,000) (73,000)
Net cash used in financing activities (153,414,000) (127,971,000) (50,134,000)
Effect of exchange rate changes on cash and cash equivalents 10,204,000 (5,436,000) (10,451,000)
Net increase (decrease) in cash and cash equivalents 3,479,000 13,868,000 (8,332,000)
Cash and cash equivalents at beginning of year 25,865,000 11,997,000 20,329,000
Cash and cash equivalents at end of year 29,344,000 25,865,000 11,997,000
Cash paid during the year for:      
Interest 19,523,000 18,474,000 16,839,000
Income taxes 29,261,000 29,217,000 46,281,000
Capitalized interest $ 486,000 $ 1,061,000 $ 944,000