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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 602,578 |
Total amount reclassified from Accumulated other comprehensive loss, net of tax | $ (774) | $ 0 | (774) | $ 0
Other comprehensive income (loss) | (25,595) | 16,280 | (9,866) | 29,008
Balance at end of period | 639,070 |  | 639,070 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (95,619) | (116,084) | (97,948) | (118,068)
Tax benefit | (614) | (935) | (1,682) | (2,043)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 3,059 | 2,157 | 5,388 | 4,141
Balance at end of period | (92,560) | (113,927) | (92,560) | (113,927)
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | 0 | 0 | 0
Tax benefit | 0 | 0 | 0 | 0
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 0 | 0 | 0 | 0
Balance at end of period | 0 | 0 | 0 | 0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from Accumulated other comprehensive loss | (131) | (109) | (213) | (218)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from Accumulated other comprehensive loss | 0 | 0 | 0 | 0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from Accumulated other comprehensive loss | 3,804 | 3,201 | 7,283 | 6,402
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from Accumulated other comprehensive loss | 0 | 0 | 0 | 0
Accumulated Foreign Currency Adjustment Attributable to Parent |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (60,584) | (100,808) | (73,814) | (112,178)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 774 | 0 | (774) | 0
Other comprehensive income (loss) | (27,607) | 14,960 | (14,377) | 26,330
Balance at end of period | (88,965) | (85,848) | (88,965) | (85,848)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 971 | (2,590) | 801 | (1,964)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 0 | 0 | 0 | 0
Other comprehensive income (loss) | (273) | (837) | (103) | (1,463)
Balance at end of period | $ 698 | $ (3,427) | $ 698 | $ (3,427)

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