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Accumulated Other Comprehensive (Loss) Income - Summary of Components of 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
Foreign currency transaction loss |  |  |  |
Foreign currency transaction gain (loss) | $ 2,194 | $ (1,162) | $ 918 | $ (1,557)
AOCI Attributable to Parent, Net of Tax |  |  |  |
Total accumulated other comprehensive (loss) income, beginning of period |  |  | (78,960) |
Total accumulated other comprehensive (loss) income, end of period | (75,862) |  | (75,862) |
Accumulated other comprehensive (loss) income |  |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |  |
Total accumulated other comprehensive (loss) income, beginning of period | (76,803) | (91,530) | (78,960) | (93,194)
Gain (Loss) recognized in OCI, Net | (189) | 58 | 950 | 810
Gain (Loss) reclassified from AOCI to income, Net | 1,130 | 932 | 2,148 | 1,844
Total accumulated other comprehensive (loss) income, end of period | (75,862) | (90,540) | (75,862) | (90,540)
Changes in fair market value of hedges |  |  |  |
Changes in AOCI, Gross |  |  |  |
Gross, beginning of the period | 1,332 | 1,308 | 289 | 116
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 240 | (223) | 1,397 | 819
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (154) | (15) | (268) | 135
Gross, ending balance | 1,418 | 1,070 | 1,418 | 1,070
Changes in AOCI, Income tax (benefit) |  |  |  |
Income tax (benefit), beginning of period | (341) | (474) | (105) | (42)
Income tax (benefit), Gain (Loss) recognized in OCI | (54) | 81 | (315) | (297)
Income tax (benefit), Gain (Loss) reclassified from AOCI to income | 35 | 5 | 60 | (49)
Income tax (benefit), ending of period | (360) | (388) | (360) | (388)
AOCI Attributable to Parent, Net of Tax |  |  |  |
Total accumulated other comprehensive (loss) income, beginning of period | 991 | 834 | 184 | 74
Gain (Loss) recognized in OCI, Net | 186 | (142) | 1,082 | 522
Gain (Loss) reclassified from AOCI to income, Net | (119) | (10) | (208) | 86
Total accumulated other comprehensive (loss) income, end of period | 1,058 | 682 | 1,058 | 682
Changes in unrealized pension cost |  |  |  |
Changes in AOCI, Gross |  |  |  |
Gross, beginning of the period | (128,672) | (150,322) | (130,096) | (151,618)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0 | 0 | 0 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 1,617 | 1,466 | 3,041 | 2,762
Gross, ending balance | (127,055) | (148,856) | (127,055) | (148,856)
Changes in AOCI, Income tax (benefit) |  |  |  |
Income tax (benefit), beginning of period | 52,520 | 60,192 | 52,837 | 60,672
Income tax (benefit), Gain (Loss) recognized in OCI | 0 | 0 | 0 | 0
Income tax (benefit), Gain (Loss) reclassified from AOCI to income | (368) | (524) | (685) | (1,004)
Income tax (benefit), ending of period | 52,152 | 59,668 | 52,152 | 59,668
AOCI Attributable to Parent, Net of Tax |  |  |  |
Total accumulated other comprehensive (loss) income, beginning of period | (76,152) | (90,130) | (77,259) | (90,946)
Gain (Loss) recognized in OCI, Net | 0 | 0 | 0 | 0
Gain (Loss) reclassified from AOCI to income, Net | 1,249 | 942 | 2,356 | 1,758
Total accumulated other comprehensive (loss) income, end of period | (74,903) | (89,188) | (74,903) | (89,188)
Cumulative translation adjustment |  |  |  |
Changes in AOCI, Gross |  |  |  |
Gross, beginning of the period | (1,747) | (2,328) | (1,985) | (2,414)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (368) | 196 | (130) | 282
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 0 | 0 | 0 | 0
Gross, ending balance | (2,115) | (2,132) | (2,115) | (2,132)
Changes in AOCI, Income tax (benefit) |  |  |  |
Income tax (benefit), beginning of period | 105 | 94 | 100 | 92
Income tax (benefit), Gain (Loss) recognized in OCI | (7) | 4 | (2) | 6
Income tax (benefit), Gain (Loss) reclassified from AOCI to income | 0 | 0 | 0 | 0
Income tax (benefit), ending of period | 98 | 98 | 98 | 98
AOCI Attributable to Parent, Net of Tax |  |  |  |
Total accumulated other comprehensive (loss) income, beginning of period | (1,642) | (2,234) | (1,885) | (2,322)
Gain (Loss) recognized in OCI, Net | (375) | 200 | (132) | 288
Gain (Loss) reclassified from AOCI to income, Net | 0 | 0 | 0 | 0
Total accumulated other comprehensive (loss) income, end of period | $ (2,017) | $ (2,034) | $ (2,017) | $ (2,034)

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