Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Accumulated other comprehensive income (loss)	$ (200,828)	$ (143,252)
Other comprehensive income (loss) before reclassifications to consolidated statements of income	18,422	20,038
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income	1,535	1,845
Net current-period other comprehensive (loss) income	19,957	21,883
Accumulated other comprehensive income (loss)	(180,871)	(121,369)
Gains and Losses on Cash Flow Hedges
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Accumulated other comprehensive income (loss)	(227)	115
Other comprehensive income (loss) before reclassifications to consolidated statements of income	27	(239)
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income	56	91
Net current-period other comprehensive (loss) income	83	(148)
Accumulated other comprehensive income (loss)	(144)	(33)
Pension and Other Postretirement Benefit Items
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Accumulated other comprehensive income (loss)	(114,570)	(105,703)
Other comprehensive income (loss) before reclassifications to consolidated statements of income	(214)	(436)
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income	1,479	1,754
Net current-period other comprehensive (loss) income	1,265	1,318
Accumulated other comprehensive income (loss)	(113,305)	(104,385)
Foreign Currency Items
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Accumulated other comprehensive income (loss)	(86,031)	(37,664)
Other comprehensive income (loss) before reclassifications to consolidated statements of income	18,609	20,713
Amounts reclassified from accumulated other comprehensive income to the consolidated statements of income	0	0
Net current-period other comprehensive (loss) income	18,609	20,713
Accumulated other comprehensive income (loss)	$ (67,422)	$ (16,951)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

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-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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