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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities      
Net income $ 119,433 $ 104,289 $ 60,930
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation 16,830 16,739 16,951
Amortization of intangibles 19,940 21,259 21,878
Net loss (gain) on sale of property, plant and equipment 101 (8,299) 13
Loss on debt extinguishment 1,895 5,808 1,042
Deferred income taxes 4,044 (7,749) 16,573
Stock-based compensation 12,038 10,010 7,833
Non-cash interest expense 3,475 5,222 5,994
Impairment of goodwill 1,663 1,087  
Changes in operating assets and liabilities      
Accounts receivable (809) (17,618) (14,848)
Inventories 24,969 10,162 3,116
Prepaid expenses and other (10,147) 1,786 (571)
Accounts payable and accrued liabilities (13,002) (12,243) (26,787)
Other, net (1,680) 1,342 511
Net cash provided by operating activities 178,750 131,795 92,635
Cash flows from investing activities      
Capital expenditures (20,342) (20,847) (19,957)
Proceeds from sale of property, plant and equipment 19 13,203 87
Other 3,014 0 4,113
Net cash used in investing activities (17,309) (7,644) (15,757)
Cash flows from financing activities      
Proceeds from exercise of stock options 4,831 2,012 1,921
Borrowings under revolving credit facilities 618 1,134 806
Payments under revolving credit facilities (618) (1,134) (806)
Principal payments under capital lease obligations (779) (4,201) (1,898)
Proceeds from issuance of term loan credit facility 0 192,845 0
Principal payments under term loan credit facility (1,928) (194,291) (42,078)
Principal payments under industrial revenue bond (473) (496) (475)
Debt issuance costs paid 0 (2,587) 0
Convertible senior notes repurchase (98,922) (22,936) 0
Stock repurchase (79,556) (61,757) (1,497)
Net cash used in financing activities (176,827) (91,411) (44,027)
Net (decrease) increase in cash and cash equivalents (15,386) 32,740 32,851
Cash and cash equivalents at beginning of year 178,853 146,113 113,262
Cash and cash equivalents at end of year 163,467 178,853 146,113
Cash paid during the period for      
Interest 12,656 14,578 16,136
Income taxes $ 68,870 $ 66,283 $ 20,220