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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Activities      
Net income $ 62,126 $ 38,628 $ 111,272
Adjustments to reconcile net income to cash provided by operating activities:      
Pension plan settlement charge 32,218
Depreciation and amortization $ 36,235 36,706 $ 20,362
Stock-based compensation 4,530 5,647 5,288
Slow moving inventory valuation adjustment (1,468) 1,347 693
Loss (gain) on sale of assets (113) (1) 1
Deferred income taxes $ (3,257) (12,015) 5,736
Impairment of assets 178 911
Changes in operating assets and liabilities:      
Trade receivables $ (21,986) 17,649 (24,366)
Inventories 9,058 (22,775) (7,945)
Trade accounts payable and accrued expenses 6,808 (11,047) 9,231
Employee compensation and benefits 9,378 (17,435) 17,897
Product liability (101) (391) 179
Prepaid expenses, other assets and other liabilities 6,553 (13,075) (19,340)
Income taxes payable 4,806 (83) (250)
Cash provided by operating activities 112,569 55,551 119,669
Investing Activities      
Property, plant and equipment additions (28,705) (45,571) (54,616)
Proceeds from sale of assets 222 24 233
Cash used for investing activities (28,483) (45,547) (54,383)
Financing Activities      
Dividends paid (20,569) (31,446) (41,079)
Tax benefit from exercise of stock options 436 1,621 $ 2,302
Repurchase of common stock (2,841) (24,002)
Payment of employee withholding tax related to share-based compensation (999) (2,363) $ (2,423)
Proceeds from exercise of stock options 211 23
Cash used for financing activities (23,762) (56,167) $ (41,200)
Increase (decrease) in cash and cash equivalents 60,324 (46,163) 24,086
Cash and cash equivalents at beginning of year 8,901 55,064 30,978
Cash and cash equivalents at end of year $ 69,225 $ 8,901 $ 55,064