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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities      
Net income $ 50,933 $ 52,142 $ 87,472
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 31,972 34,264 35,355
Stock-based compensation 5,809 3,659 3,054
Excess and obsolescence inventory reserve (185) 358 522
Loss (gain) on sale of assets (10) 31 59
Deferred income taxes (4,371) 1,736 1,836
Changes in operating assets and liabilities:      
Trade receivables 15,051 9,360 2,279
Inventories 8,479 14,463 (17,958)
Trade accounts payable and accrued expenses 939 (16,060) 5,602
Contract liability to customers 5,250    
Employee compensation and benefits 6,009 (11,466) (3,186)
Product liability 353 (1,000) 1,075
Prepaid expenses, other assets and other liabilities (3,757) 13,704 (6,348)
Income taxes payable 3,340 (4,962)
Cash provided by operating activities 119,812 101,191 104,800
Investing Activities      
Property, plant, and equipment additions (10,541) (33,596) (35,215)
Purchases of short-term investments (114,259)
Net proceeds from sale of assets 10 3 325
Cash used for investing activities (124,790) (33,593) (34,890)
Financing Activities      
Dividends paid (19,201) (23,905) (32,815)
Tax benefit from share-based compensation 8,825
Repurchase of common stock (64,850) (14,018)
Payment of employee withholding tax related to share-based compensation (816) (2,482) (14,001)
Cash used for financing activities (20,017) (91,237) (52,009)
(Decrease) increase in cash and cash equivalents (24,995) (23,639) 17,901
Cash and cash equivalents at beginning of year 63,487 87,126 69,225
Cash and cash equivalents at end of year $ 38,492 $ 63,487 $ 87,126