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Long-Term Debt - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Feb. 23, 2016 | Feb. 22, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |
Ownership percentage, guarantors (as percent) |  |  | 100.00% |  |  |  |
Repurchase of senior unsecured debt |  |  | $ 56,925,000 | $ 0 |  |  |
Gain on extinguishment of debt | $ 11,642,000 | $ 0 | 18,658,000 | 0 |  |  |
Deferred financing costs | 36,700,000 |  | 36,700,000 |  |  |  |
Interest Expense [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amortization of deferred financing costs | 2,000,000 | 1,900,000 | 4,100,000 | 3,500,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Write-off of deferred financing costs |  | 0 |  |  |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility amount | 2,500,000,000 |  | 2,500,000,000 |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  | $ 1,150,000,000.0 | $ 1,525,000,000.0 |
Line of credit facility, amount outstanding | 35,000,000 |  | 35,000,000 |  |  |  |
Outstanding letters of credit | 14,200,000 |  | 14,200,000 |  |  |  |
Line of credit facility, remaining borrowing capacity | $ 1,100,800,000 |  | $ 1,100,800,000 |  |  |  |
Weighted average interest rate (as percent) | 2.00% |  | 2.00% |  |  |  | 1.90%
Commitment fee percentage |  |  | 0.375% |  |  |  |
Write-off of deferred financing costs | $ 0 |  | $ 1,800,000 | 500,000 |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | Other Assets [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Deferred financing costs | 5,700,000 |  | 5,700,000 |  |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, amount outstanding | $ 35,000,000 |  | $ 35,000,000 |  |  |  |
Senior Unsecured Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption percentage (up to) (as percent) |  |  | 35.00% |  |  |  |
Redemption term |  |  | 180 days |  |  |  |
Percentage of minimum outstanding principal amount (at least) |  |  | 65.00% |  |  |  |
Senior Unsecured Debt [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as percent) | 6.50% |  | 6.50% |  |  |  |
Senior Unsecured Debt [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as percent) | 7.25% |  | 7.25% |  |  |  |
Senior Unsecured Debt [Member] | Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unsecured debt | $ 2,123,400,000 |  | $ 2,123,400,000 |  |  |  |
Senior Unsecured Debt [Member] | Notes [Member] | Long-term Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Deferred financing costs | $ 31,000,000 |  | $ 31,000,000 |  |  |  |
Senior Unsecured Debt [Member] | 7.25% senior unsecured notes due February 1, 2019 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as percent) | 7.25% |  | 7.25% |  |  |  |
Amount of debt extinguished |  |  | $ 1,000,000 |  |  |  |
Senior Unsecured Debt [Member] | 6.5% senior unsecured notes due November 1, 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as percent) | 6.50% |  | 6.50% |  |  |  |
Amount of debt extinguished |  |  | $ 2,300,000 |  |  |  |
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due March 15, 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as percent) | 6.875% |  | 6.875% |  |  |  |
Amount of debt extinguished |  |  | $ 59,500,000 |  |  |  |
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due January 15, 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as percent) | 6.875% |  | 6.875% |  |  |  |
Amount of debt extinguished |  |  | $ 13,800,000 |  |  |  |
Senior Unsecured Debt [Member] | Purchased Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of debt extinguished |  |  | 76,600,000 |  |  |  |
Repurchase of senior unsecured debt |  |  | 56,900,000 |  |  |  |
Gain on extinguishment of debt | $ 11,600,000 |  | 18,700,000 |  |  |  |
Senior Unsecured Debt [Member] | Purchased Notes [Member] | Gain of Extinguishment of Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Write-off of deferred financing costs | $ 500,000 | $ 0 | $ 1,000,000 | $ 0 |  |  |

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(8)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: 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=66902209&loc=d3e3602-108585 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=49170532&loc=d3e12355-112629 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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