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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities      
Net income $ 104,289 $ 60,930 $ 46,529
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation 16,739 16,951 16,550
Amortization of intangibles 21,259 21,878 21,786
Net (gain) loss on the sale of property, plant and equipment (8,299) 13 140
Loss on debt extinguishment 5,808 1,042 1,889
Deferred income taxes (7,749) 16,573 30,089
Stock-based compensation 10,010 7,833 7,480
Non-cash interest expense 5,222 $ 5,994 $ 5,817
Impairment of intangibles 1,087
Changes in operating assets and liabilities      
Accounts receivable (17,618) $ (14,848) $ (23,691)
Inventories 10,162 3,116 6,260
Prepaid expenses and other 1,786 (571) (3,893)
Accounts payable and accrued liabilities (12,243) (26,787) 18,082
Other, net 1,342 511 1,631
Net cash provided by operating activities 131,795 92,635 128,669
Cash flows from investing activities      
Capital expenditures (20,847) (19,957) (18,352)
Acquisitions, net of cash acquired 0 0 (15,985)
Proceeds from sale of property, plant and equipment 13,203 87 305
Other 0 4,113 2,500
Net cash used in investing activities (7,644) (15,757) (31,532)
Cash flows from financing activities      
Proceeds from exercise of stock options 2,012 1,921 600
Borrowings under revolving credit facilities 1,134 806 1,166
Payments under revolving credit facilities (1,134) (806) (1,166)
Principal payments under capital lease obligations (4,201) (1,898) (1,700)
Proceeds from issuance of term loan credit facility 192,845 0 0
Principal payments under term loan credit facility (194,291) (42,078) (62,827)
Principal payments under industrial revenue bond (496) (475) (381)
Debt issuance costs paid (2,587) 0 (981)
Convertible senior notes repurchase (22,936) 0 0
Stock repurchase (61,757) (1,497) (35)
Net cash used in financing activities (91,411) (44,027) (65,324)
Net increase in cash and cash equivalents 32,740 32,851 31,813
Cash and cash equivalents at beginning of year 146,113 113,262 81,449
Cash and cash equivalents at end of year 178,853 146,113 113,262
Cash paid during the period for      
Interest 14,578 16,136 20,913
Income taxes $ 66,283 $ 20,220 $ 941