Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive loss
Accumulated other comprehensive loss, Beginning balance	$ (81,897)	$ (120,604)
Gain (Loss) recognized in OCI, Net	(26,353)	32,594
Gain (Loss) reclassified from AOCI to income, Net	4,017	6,113
Accumulated other comprehensive loss, Ending balance	(104,233)	(81,897)
Defined benefit pension item [Member]
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(998)	(1,606)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	(402)	(626)
Accumulated other comprehensive loss, Beginning balance	(596)	(980)
Gain (Loss) recognized in OCI, Gross	(510)	289
Gain (Loss) recognized in OCI, Income tax (benefit)	(167)	101
Gain (Loss) recognized in OCI, Net	(343)	188
Gain (Loss) reclassified from AOCI to income, Gross	488	319
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	185	123
Gain (Loss) reclassified from AOCI to income, Net	303	196
Accumulated other comprehensive (loss) income, Gross, Ending balance	(1,020)	(998)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	(384)	(402)
Accumulated other comprehensive loss, Ending balance	(636)	(596)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(138,133)	(199,241)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	(55,028)	(78,398)
Accumulated other comprehensive loss, Beginning balance	(83,105)	(120,843)
Gain (Loss) recognized in OCI, Gross	(37,043)	51,642
Gain (Loss) recognized in OCI, Income tax (benefit)	(12,267)	19,821
Gain (Loss) recognized in OCI, Net	(24,776)	31,821
Gain (Loss) reclassified from AOCI to income, Gross	5,885	9,466
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	2,171	3,549
Gain (Loss) reclassified from AOCI to income, Net	3,714	5,917
Accumulated other comprehensive (loss) income, Gross, Ending balance	(169,291)	(138,133)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	(65,124)	(55,028)
Accumulated other comprehensive loss, Ending balance	(104,167)	(83,105)
Unrealized gains and losses on cash flow hedges [Member]
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	949	575
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	(855)	(644)
Accumulated other comprehensive loss, Beginning balance	1,804	1,219
Gain (Loss) recognized in OCI, Gross	(704)	374
Gain (Loss) recognized in OCI, Income tax (benefit)	530	(211)
Gain (Loss) recognized in OCI, Net	(1,234)	585
Accumulated other comprehensive (loss) income, Gross, Ending balance	245	949
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	(325)	(855)
Accumulated other comprehensive loss, Ending balance	$ 570	$ 1,804

Accumulated Other Comprehensive Income Loss Tax

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- Definition

Other Comprehensive Income Loss Before Reclassifications Tax

+ References

No definition available.

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- Definition

Reclassification From Accumulated Other Comprehensive Income Current Period Tax

+ References

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- Definition

Amount before tax of increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

+ References

No definition available.

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

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

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No definition available.

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