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Long-Term Debt (Senior Unsecured Notes and Credit Agreement) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |  |
Letters of credit, amount outstanding | $ 45,600,000 |  |
Loss on debt extinguishment | 0 | 0 | 2,200,000
Write-off of deferred debt issuance costs | 0 | 0 | 400,000
Leverage Ratio, minimum threshold, current credit spread | 2.0 |  |
Leverage ratio, maximum threshold, current credit spread | 3.25 |  |
Leverage ratio, minimum threshold, increase in credit spread | 3.25 |  |
5.5% Senior Notes Due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes | 350,000,000 | 350,000,000 |
6.75% Senior Notes Due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes | 396,300,000 | 395,600,000 |
Revolving credit facility due 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity under revolving credit facility | 1,200,000,000 |  |
Revolving credit facility, amount outstanding | 300,000,000 | 540,000,000 |
Revolving credit facilities letter of credit sublimit | 200,000,000 |  |
Additional borrowing capacity under revolving credit facility | 854,400,000 |  |
Term loan facility due 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Term loan facility | $ 500,000,000 | $ 500,000,000 |
Senior Notes [Member] | 5.5% Senior Notes Due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage interest on debt instrument | 5.50% |  |
Maximum percentage of principal that can be redeemed with net cash proceeds from common stock offering | 35.00% |  |
Redemption payment as a percentage of principal cash from common stock offering | 105.50% |  |
Debt instrument, maturity date | Feb. 01, 2020 |  |
Senior Notes [Member] | 6.75% Senior Notes Due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage interest on debt instrument | 6.75% |  |
Debt instrument, maturity date | Apr. 15, 2018 |  |
Loans Payable [Member] | Term loan facility due 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, maturity date | Dec. 07, 2016 |  |
Basis spread on variable interest rates | 1.75% |  |
Impact on credit spread from increase in leverage ratio | 0.25% |  |
Line of Credit [Member] | Revolving credit facility due 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, maturity date | Dec. 07, 2016 |  |
Basis spread on variable interest rates | 1.75% |  |
Commitment fee on undrawn amounts | 0.30% |  |
Impact on credit spread from increase in leverage ratio | 0.25% |  |

X
- Definition The incremental increase, in basis points, in the credit spread under the credit agreement if the leverage ratio is greater than a specified threshold. + References No definition available. + Details
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- Definition The minimum, inclusive, leverage ratio, as defined in the credit agreement, in which the credit spread on the revolver and term loan would increase based on the pricing terms outlined in the agreement. + References No definition available. + Details
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- Definition The maximum, exclusive, leverage ratio, as defined in the credit agreement, in which the current credit spread on the revolver and term loan applies based on pricing terms outlined in the credit agreement. + References No definition available. + Details
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- Definition The minimum, inclusive, leverage ratio, as defined in the credit agreement, in which the current credit spread on the revolver and term loan applies based on pricing terms outlined in the agreement. + References No definition available. + Details
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- Definition Percentage of the debt instrument outstanding that may be redeemed with the net cash proceeds of one or more public equity offerings of the company's common stock. + References No definition available. + Details
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- Definition Payment amount as a percentage of principal at which the debt instrument may be redeemed with the net cash proceeds of one or more public equity offerings of the company's common stock. + References No definition available. + Details
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- Definition The maximum amount of letters of credit that can be issued under the terms of the revolving credit facilities. + References No definition available. + Details
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- Definition Interest rate stated in the contractual 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 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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