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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Operating Activities        
Earnings (loss) $ (3,126) $ (102) $ (7,588) $ (11,286)
Items not affecting cash        
Depreciation and amortization 8,189 8,167 16,330 16,347
Amortization of Debt Issuance Costs 600 652 1,208 1,138
Deferred income taxes (865) (3,823) (2,151) (9,915)
Stock-based compensation 2,104 1,286 4,275 2,138
Unrealized Loss (Gain) on Derivatives Instrument (2,764) (1,267) (1,243) (1,229)
Fair Value of Contingent Consideration 43 204 (2,373) 204
Impairment of long-lived assets 70 0 409 3,723
Other (148) (244) (147) (101)
Changes in non-cash working capital, net of business acquired (38,324) (30,648) (35,435) (7,313)
Net Cash Provided by (Used in) Operating Activities, Total (34,221) (25,775) (26,715) (6,294)
Investing activities        
Purchases of property, plant and equipment (10,428) (7,143) (17,163) (16,167)
Proceeds From Sale Of Property Plant And Equipment 30 51 730 301
Minority Interest Decrease From Redemptions       0
Other 389 254 389 364
Net cash flows from investing activities (10,009) (6,838) (16,044) (15,502)
Financing activities        
Increase (decrease) under line of credit facilities 49,885 36,690 50,194 29,349
Repayment of long-term debt (415) (589) (937) (1,116)
Payments Of Dividends (1,700) (1,700) (3,400) (3,291)
Proceeds From Stock Options Exercised 91 2,535 240 3,629
Payment of contingent consideration (4,399) (4,330) (4,399) (4,330)
Other (5) (101) (45) (303)
Net Cash Provided By (Used In) Financing Activities 43,457 32,505 41,653 23,938
Foreign exchange gain (loss) on cash held in a foreign currency (64) 54 (35) 64
Increase (decrease) in cash and cash equivalents during the period (837) (54) (1,141) 2,206
Discontinued operations cash activity included above:        
Cash and cash equivalents - beginning of the period 2,924 3,511 3,228 1,251
Cash and cash equivalents - end of the period 2,087 3,457 2,087 3,457
Noncash Investing And Financing Items [Abstract]        
Accrued Dividends $ (1,700) $ (1,700) $ (1,700) $ (1,700)