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Accumulated Other Comprehensive Income (Loss) - Changes by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |  |
Beginning balance |  | $ 536,028 |  | $ 536,028 |
Total other comprehensive (loss) income, net | $ (10,516) |  | $ 1,773 | (7,453) | $ 7,337
Reclassification of stranded effects of the Act |  | 556 |  |  |
Ending balance | 572,089 |  |  | 572,089 |
Total [Member] |  |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |  |
Beginning balance |  | (51,056) |  | (51,056) | (66,956)
Other comprehensive (loss) income before reclassifications |  |  |  | (7,472) | 9,193
Amounts reclassified from AOCI |  |  |  | (129) | (2,691)
Total other comprehensive (loss) income, net |  |  |  | (7,601) | 6,502
Reclassification of stranded effects of the Act |  |  |  | 556 |
Ending balance | (58,101) |  | (60,454) | (58,101) | (60,454)
Cumulative Translation Adjustment [Member] |  |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |  |
Beginning balance |  | (38,163) |  | (38,163) | (49,965)
Other comprehensive (loss) income before reclassifications |  |  |  | (6,793) | 11,058
Amounts reclassified from AOCI |  |  |  | 0 | (3,777)
Total other comprehensive (loss) income, net |  |  |  | (6,793) | 7,281
Reclassification of stranded effects of the Act |  |  |  | 0 |
Ending balance | (44,956) |  | (42,684) | (44,956) | (42,684)
Unrealized (Loss) Gain on Derivatives [Member] |  |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |  |
Beginning balance |  | 847 |  | 847 | (300)
Other comprehensive (loss) income before reclassifications |  |  |  | (752) | (657)
Amounts reclassified from AOCI |  |  |  | (275) | 974
Total other comprehensive (loss) income, net |  |  |  | (1,027) | 317
Reclassification of stranded effects of the Act |  |  |  | 112 |
Ending balance | (68) |  | 17 | (68) | 17
Pension/OPEB Liability Adjustment [Member] |  |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |  |
Beginning balance |  | (20,610) |  | (20,610) | (23,046)
Other comprehensive (loss) income before reclassifications |  |  |  | 353 | (856)
Amounts reclassified from AOCI |  |  |  | 146 | 491
Total other comprehensive (loss) income, net |  |  |  | 499 | (365)
Reclassification of stranded effects of the Act |  |  |  | (1,018) |
Ending balance | (21,129) |  | (23,411) | (21,129) | (23,411)
Unrealized Gain (Loss) on Equity Securities [Member] |  |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |  |
Beginning balance |  | 0 |  | 0 | 380
Other comprehensive (loss) income before reclassifications |  |  |  | 0 | (1)
Amounts reclassified from AOCI |  |  |  | 0 | (379)
Total other comprehensive (loss) income, net |  |  |  | 0 | (380)
Reclassification of stranded effects of the Act |  |  |  | 0 |
Ending balance | 0 |  | 0 | 0 | 0
Attributable to Unconsolidated Affiliates [Member] |  |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |  |
Beginning balance |  | $ 6,870 |  | 6,870 | 5,975
Other comprehensive (loss) income before reclassifications |  |  |  | (280) | (351)
Amounts reclassified from AOCI |  |  |  | 0 | 0
Total other comprehensive (loss) income, net |  |  |  | (280) | (351)
Reclassification of stranded effects of the Act |  |  |  | 1,462 |
Ending balance | $ 8,052 |  | $ 5,624 | $ 8,052 | $ 5,624

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