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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities      
Net income $ 52,142 $ 87,472 $ 62,126
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 34,264 35,355 36,235
Stock-based compensation 3,659 3,054 4,530
Excess and obsolescence inventory reserve 358 522 (1,468)
Loss (gain) on sale of assets 31 59 (113)
Deferred income taxes 1,736 1,836 (3,257)
Changes in operating assets and liabilities:      
Trade receivables 9,360 2,279 (21,986)
Inventories 14,463 (17,958) 9,058
Trade accounts payable and accrued expenses (16,060) 5,602 6,808
Employee compensation and benefits (11,466) (3,186) 9,378
Product liability (1,000) 1,075 (101)
Prepaid expenses, other assets and other liabilities 13,704 (6,348) 6,553
Income taxes payable (4,962) 4,806
Cash provided by operating activities 101,191 104,800 112,569
Investing Activities      
Property, plant, and equipment additions (33,596) (35,215) (28,705)
Net proceeds from sale of assets 3 325 222
Cash used for investing activities (33,593) (34,890) (28,483)
Financing Activities      
Dividends paid (23,905) (32,815) (20,569)
Tax benefit from share-based compensation 8,825 436
Repurchase of common stock (64,850) (14,018) (2,841)
Payment of employee withholding tax related to share-based compensation (2,482) (14,001) (999)
Proceeds from exercise of stock options 211
Cash used for financing activities (91,237) (52,009) (23,762)
(Decrease) increase in cash and cash equivalents (23,639) 17,901 60,324
Cash and cash equivalents at beginning of year 87,126 69,225 8,901
Cash and cash equivalents at end of year $ 63,487 $ 87,126 $ 69,225