Restructuring Costs (Schedule of Restructuring Costs) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
Jun. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017 |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | $ 1,464 | $ 543 | $ 2,066 | $ 1,224 |
2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 1,464 | 543 | 2,066 | 1,224 |
Cumulative restructuring charges | 13,564 | | 13,564 | |
Severance costs | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | | | 431 | 263 |
Severance costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 510 | 248 | 431 | 263 |
Cumulative restructuring charges | 6,918 | | 6,918 | |
Lease termination costs | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | | | 36 | 136 |
Lease termination costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | | 53 | 36 | 136 |
Cumulative restructuring charges | 640 | | 640 | |
Other costs | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | | | 1,599 | 825 |
Other costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 954 | 242 | 1,599 | 825 |
Cumulative restructuring charges | 6,006 | | 6,006 | |
Operating Segments | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 1,464 | 552 | 2,066 | 1,233 |
Operating Segments | Finishing | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | (77) | 379 | (71) | 508 |
Cumulative restructuring charges | 7,064 | | 7,064 | |
Operating Segments | Finishing | Severance costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 98 | 254 | 19 | 261 |
Cumulative restructuring charges | 4,484 | | 4,484 | |
Operating Segments | Finishing | Lease termination costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | | 5 | 36 | 25 |
Cumulative restructuring charges | 468 | | 468 | |
Operating Segments | Finishing | Other costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | (175) | 120 | (126) | 222 |
Cumulative restructuring charges | 2,112 | | 2,112 | |
Operating Segments | Components | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 600 | 110 | 874 | 474 |
Cumulative restructuring charges | 3,100 | | 3,100 | |
Operating Segments | Components | Severance costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 164 | 0 | 164 | 0 |
Cumulative restructuring charges | 600 | | 600 | |
Operating Segments | Components | Lease termination costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | | 0 | 0 | 0 |
Cumulative restructuring charges | 0 | | 0 | |
Operating Segments | Components | Other costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 436 | 110 | 710 | 474 |
Cumulative restructuring charges | 2,500 | | 2,500 | |
Operating Segments | Seating | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 144 | 0 | 144 | (17) |
Cumulative restructuring charges | 203 | | 203 | |
Operating Segments | Seating | Severance costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 144 | 0 | 144 | (17) |
Cumulative restructuring charges | 203 | | 203 | |
Operating Segments | Seating | Lease termination costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | | 0 | 0 | 0 |
Cumulative restructuring charges | 0 | | 0 | |
Operating Segments | Seating | Other costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 0 | 0 | 0 | 0 |
Cumulative restructuring charges | 0 | | 0 | |
Operating Segments | Acoustics | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 797 | 63 | 1,119 | 268 |
Cumulative restructuring charges | 2,609 | | 2,609 | |
Operating Segments | Acoustics | Severance costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 104 | 3 | 104 | 28 |
Cumulative restructuring charges | 1,043 | | 1,043 | |
Operating Segments | Acoustics | Lease termination costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | | 48 | 0 | 111 |
Cumulative restructuring charges | 172 | | 172 | |
Operating Segments | Acoustics | Other costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 693 | 12 | 1,015 | 129 |
Cumulative restructuring charges | 1,394 | | 1,394 | |
Corporate | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 0 | (9) | 0 | (9) |
Corporate | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 0 | (9) | 0 | (9) |
Cumulative restructuring charges | 588 | | 588 | |
Corporate | Severance costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 0 | (9) | 0 | (9) |
Cumulative restructuring charges | 588 | | 588 | |
Corporate | Lease termination costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | | 0 | 0 | 0 |
Cumulative restructuring charges | 0 | | 0 | |
Corporate | Other costs | 2016 Program | | | | |
Restructuring Cost and Reserve [Line Items] | | | | |
Current period restructuring charges | 0 | $ 0 | 0 | $ 0 |
Cumulative restructuring charges | $ 0 | | $ 0 | |