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Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($)
$ in Thousands
 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ 28,140 $ (1,349)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 48,591 49,465
Debt related amortization included in interest expense 5,083 6,241
Stock-based compensation 6,107 7,950
Non-cash (gain) loss on cost and equity method investments (763) 4,825
Other non-cash (gains) losses (2,307) 6,542
Deferred income taxes 8,894 (2,447)
Changes in operating assets and liabilities:    
Accounts receivable (11,306) (6,313)
Inventories (20,948) (9,451)
Prepaid expenses and other current assets 3,306 2,515
Accounts payable 8,898 15,373
Accrued expenses (3,929) 215
Income taxes (2,547) 3,599
Net cash provided by operating activities 67,219 77,165
Cash flows from investing activities:    
Acquisition of property, plant and equipment (19,224) (22,438)
Purchase of cost and equity method investments (831) (497)
Other investing activities (960) (672)
Net cash used in investing activities (19,095) (22,263)
Cash flows from financing activities:    
Principal payments of long-term debt (75,062) (118,839)
Proceeds from issuance of long-term debt 0 50,000
Proceeds from the exercise of stock options 3,625 8,725
Payment of debt issuance costs (688) (1,789)
Withholding tax paid related to stock-based compensation (2,206) 0
Other financing activities (192) 0
Net cash used in financing activities (74,523) (61,903)
Effect of foreign currency exchange rates on cash and cash equivalents 2,363 1,418
Net decrease in cash and cash equivalents (24,036) (5,583)
Cash and cash equivalents, beginning of period 44,096 52,116
Cash and cash equivalents, end of period 20,060 46,533
Total cash and cash equivalents, end of period 44,096 52,116
Noncash investing and financing activities:    
Property, plant and equipment purchases included in accounts payable $ 3,002 $ 4,825