Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated other comprehensive loss
Accumulated other comprehensive loss	$ (93,194)	$ (99,005)	$ (104,233)
Gain (Loss) recognized in OCI, Net	(1,190)	(2,060)
Gain (Loss) reclassified from AOCI to income, Net	7,001	7,288
Defined benefit pension item
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(768)	(1,020)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	289	384
Accumulated other comprehensive loss	74	(479)	(636)
Gain (Loss) recognized in OCI, Gross	(56)	(516)
Gain (Loss) recognized in OCI, Income tax (benefit)	20	194
Gain (Loss) recognized in OCI, Net	(36)	(322)
Gain (Loss) reclassified from AOCI to income, Gross	940	768
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	(351)	(289)
Gain (Loss) reclassified from AOCI to income, Net	589	479
Accumulated other comprehensive (loss) income, Gross, Ending balance	116	(768)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	(42)	289
Accumulated Defined Benefit Plans Adjustment
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(161,719)	(169,291)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	64,361	65,124
Accumulated other comprehensive loss	(90,946)	(97,358)	(104,167)
Gain (Loss) recognized in OCI, Gross	0	0
Gain (Loss) recognized in OCI, Income tax (benefit)	0	0
Gain (Loss) recognized in OCI, Net	0	0
Gain (Loss) reclassified from AOCI to income, Gross	10,101	7,572
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	(3,689)	(763)
Gain (Loss) reclassified from AOCI to income, Net	6,412	6,809
Accumulated other comprehensive (loss) income, Gross, Ending balance	(151,618)	(161,719)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	60,672	64,361
Unrealized gains and losses on cash flow hedges
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(1,279)	245
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	111	325
Accumulated other comprehensive loss	(2,322)	(1,168)	$ 570
Gain (Loss) recognized in OCI, Gross	(1,135)	(1,524)
Gain (Loss) recognized in OCI, Income tax (benefit)	(19)	(214)
Gain (Loss) recognized in OCI, Net	(1,154)	(1,738)
Gain (Loss) reclassified from AOCI to income, Gross	0	0
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	0	0
Gain (Loss) reclassified from AOCI to income, Net	0	0
Accumulated other comprehensive (loss) income, Gross, Ending balance	(2,414)	(1,279)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	$ 92	$ 111

Accumulated Other Comprehensive Income Loss Tax

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Reclassification From Accumulated Other Comprehensive Income Current Period Tax

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- Definition

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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- Definition

Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. 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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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
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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before tax of 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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