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Debt Senior Notes (Details) (USD $)	0 Months Ended
	Sep. 25, 2014	Sep. 30, 2014	Sep. 25, 2014	Dec. 31, 2013
5.875% Senior Notes, Due 2024
Debt Instrument [Line Items]
Unamortized debt issuance expense	$ 3,800,000		$ 3,800,000
5.875% Senior Notes, Due 2024 | Senior Notes
Debt Instrument [Line Items]
Face amount			250,000,000
Interest rate		5.875%	5.875%	5.875%
Days of interest payment failure to be considered default	30 days
Maximum excess proceeds on sale of asset	$ 25,000,000
Days of failure to comply with other indenture agreements to be considered default	60 days
5.125% Senior Notes, Due 2023 | Senior Notes
Debt Instrument [Line Items]
Interest rate		5.125%		5.125%
5.875% Senior Notes, Due 2022 | Senior Notes
Debt Instrument [Line Items]
Interest rate		5.875%		5.875%
6.625% Senior Notes, Due 2021 | Senior Notes
Debt Instrument [Line Items]
Interest rate	6.625%	6.625%	6.625%	6.625%
Prior to October 15, 2017 | 5.875% Senior Notes, Due 2024 | Senior Notes
Debt Instrument [Line Items]
Percentage of principal amount redeemable	35.00%
Redemption price percentage	105.875%
October 15, 2017 to October 14, 2019 | 5.875% Senior Notes, Due 2024 | Senior Notes
Debt Instrument [Line Items]
Redemption price percentage	100.00%
On or after October 15, 2019 | Maximum | 5.875% Senior Notes, Due 2024 | Senior Notes
Debt Instrument [Line Items]
Notice period prior to redemption	60 days
On or after October 15, 2019 | Minimum | 5.875% Senior Notes, Due 2024 | Senior Notes
Debt Instrument [Line Items]
Notice period prior to redemption	30 days
October 15, 2019 to October 14, 2020 | 5.875% Senior Notes, Due 2024 | Senior Notes
Debt Instrument [Line Items]
Redemption price percentage	102.938%
October 15, 2020 to October 14, 2021 | 5.875% Senior Notes, Due 2024 | Senior Notes
Debt Instrument [Line Items]
Redemption price percentage	101.958%
October 15, 2021 to October 14, 2022 | 5.875% Senior Notes, Due 2024 | Senior Notes
Debt Instrument [Line Items]
Redemption price percentage	100.979%
October 15, 2022 and thereafter | 5.875% Senior Notes, Due 2024 | Senior Notes
Debt Instrument [Line Items]
Redemption price percentage	100.00%

X

- Definition

Debt Instrument, Debt Default, Description of Violation or Event of Default, Failure to Comply with Other Indenture Agreements

+ References

No definition available.

+ Details

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X

- Definition

Debt Instrument, Debt Default, Description of Violation or Event of Default, Interest Payment Failure

+ References

No definition available.

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- Definition

Debt Instrument, Debt Default, Description of Violation or Event of Default, Maximum Excess Proceeds on Sale of Asset

+ References

No definition available.

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- Definition

Debt Instrument, Notice Period Prior to Redemption

+ References

No definition available.

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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- Definition

Percentage of principal amount of debt redeemed.

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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