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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net income $ 111,422 $ 119,433 $ 104,289
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation 18,012 16,830 16,739
Amortization of intangibles 17,041 19,940 21,259
Net (gain) loss on sale of property, plant and equipment (8,046) 101 (8,299)
Loss on debt extinguishment 799 1,895 5,808
Deferred income taxes (14,682) 4,044 (7,749)
Stock-based compensation 10,429 12,038 10,010
Non-cash interest expense 2,258 3,475 5,222
Impairment of goodwill and other intangibles 0 1,663 1,087
Changes in operating assets and liabilities      
Accounts receivable 31,943 (809) (17,618)
Inventories (13,158) 24,969 10,162
Prepaid expenses and other (2,014) (10,147) 1,786
Accounts payable and accrued liabilities (963) (13,002) (12,243)
Other, net (8,662) (1,680) 1,342
Net cash provided by operating activities 144,379 178,750 131,795
Cash flows from investing activities      
Capital expenditures (26,056) (20,342) (20,847)
Proceeds from sale of property, plant and equipment 10,860 19 13,203
Acquisitions, net of cash acquired (323,487) 0 0
Other, net 6,443 3,014 0
Net cash used in investing activities (332,240) (17,309) (7,644)
Cash flows from financing activities      
Proceeds from exercise of stock options 5,790 4,831 2,012
Borrowings under senior notes 325,000 0 0
Dividends paid (15,315) 0 0
Borrowings under revolving credit facilities 713 618 1,134
Payments under revolving credit facilities (713) (618) (1,134)
Principal payments under capital lease obligations (600) (779) (4,201)
Proceeds from issuance of term loan credit facility 377,519 0 192,845
Principal payments under term loan credit facility (386,577) (1,928) (194,291)
Principal payments under industrial revenue bond (583) (473) (496)
Debt issuance costs paid (6,783) 0 (2,587)
Convertible senior notes repurchase (8,045) (98,922) (22,936)
Stock repurchase (74,491) (79,556) (61,757)
Net cash provided by (used in) financing activities 215,915 (176,827) (91,411)
Net increase (decrease) in cash and cash equivalents 28,054 (15,386) 32,740
Cash and cash equivalents at beginning of year 163,467 178,853 146,113
Cash and cash equivalents at end of year 191,521 163,467 178,853
Cash paid during the period for      
Interest 8,394 12,656 14,578
Income taxes $ 41,391 $ 68,870 $ 66,283