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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Activities      
Net income $ 87,472 $ 62,126 $ 38,628
Adjustments to reconcile net income to cash provided by operating activities:      
Pension plan settlement charge     32,218
Depreciation and amortization 35,355 36,235 36,706
Stock-based compensation 3,054 4,530 5,647
Excess and obsolescence inventory reserve 522 (1,468) 1,347
Loss (gain) on sale of assets 59 (113) (1)
Deferred income taxes 1,836 (3,257) (12,015)
Impairment of assets     178
Changes in operating assets and liabilities:      
Trade receivables 2,279 (21,986) 17,649
Inventories (17,958) 9,058 (22,775)
Trade accounts payable and accrued expenses 5,602 6,808 (11,047)
Employee compensation and benefits (3,186) 9,378 (17,435)
Product liability 1,075 (101) (391)
Prepaid expenses, other assets and other liabilities (6,348) 6,553 (13,075)
Income taxes payable (4,962) 4,806 (83)
Cash provided by operating activities 104,800 112,569 55,551
Investing Activities      
Property, plant and equipment additions (35,215) (28,705) (45,571)
Net proceeds from sale of assets 325 222 24
Cash used for investing activities (34,890) (28,483) (45,547)
Financing Activities      
Dividends paid (32,815) (20,569) (31,446)
Tax benefit from share-based compensation 8,825 436 1,621
Repurchase of common stock (14,018) (2,841) (24,002)
Payment of employee withholding tax related to share-based compensation (14,001) (999) (2,363)
Proceeds from exercise of stock options   211 23
Cash used for financing activities (52,009) (23,762) (56,167)
Increase (decrease) in cash and cash equivalents 17,901 60,324 (46,163)
Cash and cash equivalents at beginning of year 69,225 8,901 55,064
Cash and cash equivalents at end of year $ 87,126 $ 69,225 $ 8,901