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Derivative Financial Instruments (Fair Values of Derivative Instruments Designated as Cash Flow Hedges) (Details) - USD ($)
$ in Thousands

Sep. 30, 2017

Dec. 31, 2016

Derivatives, Fair Value [Line Items]

Derivatives designated as cash flow hedges, asset derivatives

$ 16,027

$ 16,943

Derivatives designated as cash flow hedges, liability derivatives

(4,202)

(8,868)

Interest Rate Swap [Member] | Accrued Liabilities [Member]

Derivatives, Fair Value [Line Items]

Derivatives designated as cash flow hedges, liability derivatives

(1,857)

^[1]

(3,260)

Interest Rate Swap [Member] | Other Long-term Liabilities [Member}

Derivatives, Fair Value [Line Items]

Derivatives designated as cash flow hedges, liability derivatives

(1,616)

(2,350)

Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member]

Derivatives, Fair Value [Line Items]

Derivatives designated as cash flow hedges, asset derivatives

2,748

^[1]

127

Interest Rate Swap [Member] | Other Assets [Member]

Derivatives, Fair Value [Line Items]

Derivatives designated as cash flow hedges, asset derivatives

11,721

13,822

Fuel [Member] | Commodity Contract [Member] | Accrued Liabilities [Member]

Derivatives, Fair Value [Line Items]

Derivatives designated as cash flow hedges, liability derivatives

(729)

^[2]

(3,258)

Fuel [Member] | Commodity Contract [Member] | Prepaid Expenses and Other Current Assets [Member]

Derivatives, Fair Value [Line Items]

Derivatives designated as cash flow hedges, asset derivatives

1,317

^[2]

1,343

Fuel [Member] | Commodity Contract [Member] | Other Assets [Member]

Derivatives, Fair Value [Line Items]

Derivatives designated as cash flow hedges, asset derivatives

$ 241

$ 1,651

[1]	Represents the estimated amount of the existing unrealized gains and losses, respectively, on interest rate swaps as of September 30, 2017 (based on the interest rate yield curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in interest rates.
[2]	Represents the estimated amount of the existing unrealized gains and losses, respectively, on fuel hedges as of September 30, 2017 (based on the forward DOE diesel fuel index curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in diesel fuel prices.

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_AccruedLiabilitiesMember
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- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
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X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
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- Details

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- Details

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- Details

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