Subsidiary Guarantors - Senior Notes (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Senior Notes [Line Items]
Carrying value of senior notes	$ 550,000,000us-gaap_SeniorNotes	$ 550,000,000us-gaap_SeniorNotes
Covenants for senior credit facilities - amount available under restricted payment basket	85,200,000
Event of default for senior notes - failure of other debt payment at maturity in excess of this amount	50,000,000
Our ownership percentage of subsidiary guarantors of senior notes	100.00%
Event of default for senior notes - not discharged, bonded or insured judgment in excess of this amount	50,000,000
Senior Notes Due 2020 [Member]
Senior Notes [Line Items]
Carrying value of senior notes	300,000,000	300,000,000
Interest rate of senior notes	6.625%
Portion of proceeds from senior notes used to repay outstanding term debt	200,000,000
Percentage of original aggregate principle amount of senior notes included in repurchase price at change of control	101.00%
Senior Notes Due 2020 [Member] \| Senior Notes, Redemption, Period One [Member]
Senior Notes [Line Items]
Senior notes, redemption price, percentage	103.313%
Senior Notes Due 2020 [Member] \| Senior Notes, Redemption, Period Four [Member]
Senior Notes [Line Items]
Senior notes, redemption price, percentage	100.00%
Senior Notes Due 2021 [Member]
Senior Notes [Line Items]
Carrying value of senior notes	250,000,000	250,000,000
Interest rate of senior notes	4.75%
Portion of proceeds from senior notes used to repurchase shares of common stock	$ 200,000,000
Percentage of original aggregate principle amount of senior notes included in repurchase price at change of control	101.00%
Senior Notes Due 2021 [Member] \| Senior Notes, Redemption, Period One [Member]
Senior Notes [Line Items]
Senior notes, redemption price, percentage	103.563%
Senior Notes Due 2021 [Member] \| Senior Notes, Redemption, Period Four [Member]
Senior Notes [Line Items]
Senior notes, redemption price, percentage	100.00%

Covenants for senior notes - amount available under restricted payment basket

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- Definition

Event of default - Failure of other debt payment in excess.

+ References

No definition available.

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- Definition

Event of default - Not discharged judgment in excess.

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- Definition

Our ownership percentage of subsidiary guarantor.

+ References

No definition available.

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- Definition

Percentage of original aggregate principle.

+ References

No definition available.

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- Definition

Proceeds to repay term debt.

+ References

No definition available.

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- Definition

Proceeds to repurchase shares of common stock

+ References

No definition available.

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- 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

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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