Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (49,498)	$ (80,021)
Other comprehensive income before reclassifications	(55,902)	8,877
Pension/postretirement settlements and curtailments	5,167
Pension/postretirement plan remeasurement	(9,265)	13,771
Interest expense related to swaps reclassified to the Statement of Income, net of tax	1,168	1,159
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax	563	2,226
Net current period other comprehensive income	(58,269)	30,523
Ending balance	(107,767)	(49,498)
Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits		4,864
Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits		(374)
Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(138)	(7,659)
Other comprehensive income before reclassifications	(55,102)	7,521
Pension/postretirement settlements and curtailments
Pension/postretirement plan remeasurement
Interest expense related to swaps reclassified to the Statement of Income, net of tax
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax
Net current period other comprehensive income	(55,102)	7,521
Ending balance	(55,240)	(138)
Translation Adjustments [Member] \| Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits
Translation Adjustments [Member] \| Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits
Pension and Postretirement Liability Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(48,383)	(69,484)
Other comprehensive income before reclassifications	252	614
Pension/postretirement settlements and curtailments	5,167
Pension/postretirement plan remeasurement	(9,265)	13,771
Interest expense related to swaps reclassified to the Statement of Income, net of tax
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax	563	2,226
Net current period other comprehensive income	(3,283)	21,101
Ending balance	(51,666)	(48,383)
Pension and Postretirement Liability Adjustments [Member] \| Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits		4,864
Pension and Postretirement Liability Adjustments [Member] \| Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits		(374)
Derivative Valuation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(977)	(2,878)
Other comprehensive income before reclassifications	(1,052)	742
Pension/postretirement settlements and curtailments
Pension/postretirement plan remeasurement
Interest expense related to swaps reclassified to the Statement of Income, net of tax	1,168	1,159
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax
Net current period other comprehensive income	116	1,901
Ending balance	(861)	(977)
Derivative Valuation Adjustment [Member] \| Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits
Derivative Valuation Adjustment [Member] \| Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension/Postretirement plan change in benefits

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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.

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Amount after tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).

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Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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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 adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss related to net period benefit cost (credit) for pension and other postretirement defined benefit plans.

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