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Debt (Narrative) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 23, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Feb. 01, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior unsecured notes |  | $ 1,839,933,000 |  |  | $ 1,839,933,000 |  | $ 1,050,639,000 |
Note Tender Offer |  |  | $ 300,100,000 |  |  |  |  |
Redemption Premium |  |  | 49,900,000 |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  | 0 | $ 19,225,000 | $ 0 | 19,225,000 | $ 0 |  |
Six Point Seven Five Percentage Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  | 10,067,000 |  |  | 10,067,000 |  | 0 |
7.875% Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior unsecured notes |  | $ 0 |  |  | $ 0 |  | $ 350,639,000 |
Senior unsecured notes, stated rate |  | 7.875% |  |  | 7.875% |  | 7.875% |
Debt Instrument, Unamortized Premium |  | $ 0 |  |  | $ 0 |  | $ 639,000 |
Six Percentage Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior unsecured notes |  | $ 400,000,000 |  |  | $ 400,000,000 |  | $ 0 |
Senior unsecured notes, stated rate |  | 6.00% |  |  | 6.00% |  | 6.00% |
Unsecured Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 350,000,000
Senior Secured Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, amount outstanding |  | $ 1,014,100,000 |  |  | $ 1,014,100,000 |  |  |
Line Of Credit Facility Aggregate Maximum Borrowing Capacity |  | 2,000,000,000 |  |  | 2,000,000,000 |  |  |
Total amount available for borrowings under credit facility |  | 469,300,000 |  |  | 469,300,000 |  |  |
Senior Secured Credit Facility [Member] | Letters Of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letters of credit, outstanding amount |  | 16,600,000 |  |  | 16,600,000 |  |  |
Senior Secured Credit Facility [Member] | Accordion Feature [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | 200,000,000 |  |  | 200,000,000 |  |  |
Five Point Seventy Five Percentage Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior unsecured notes |  | $ 350,000,000 |  |  | $ 350,000,000 |  | $ 350,000,000 |
Senior unsecured notes, stated rate |  | 5.75% |  |  | 5.75% |  | 5.75% |
Five Point Six Two Five Percentage Senior Unsecured Notes [Member] [Domain] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior unsecured notes |  | $ 350,000,000 |  |  | $ 350,000,000 |  | $ 350,000,000 |
Senior unsecured notes, stated rate |  | 5.625% |  |  | 5.625% |  | 5.625% |
Six Point Seven Five Percentage Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior unsecured notes |  | $ 739,933,000 |  |  | $ 739,933,000 |  | $ 0 |
Senior unsecured notes, stated rate |  | 6.75% |  |  | 6.75% |  |  |
Proceeds from Debt, Net of Issuance Costs | $ 728,600,000 |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 750,000,000 | $ 750,000,000 |  |  | $ 750,000,000 |  |  |
Amended Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | 1,500,000,000 |  |  | 1,500,000,000 |  |  |
Amended Facility [Member] | Senior Secured Credit Facility [Member] | Accordion Feature [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | 500,000,000 |  |  | $ 500,000,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letter of Credit, Fee Percentage |  |  |  |  | 1.50% |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  | 0.25% |  |  |
Minimum [Member] | Eurodollar Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letter of Credit, Fee Percentage |  |  |  |  | 1.50% |  |  |
Minimum [Member] | Alternate Base Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letter of Credit, Fee Percentage |  |  |  |  | 0.50% |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letter of Credit, Fee Percentage |  |  |  |  | 2.50% |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  | 0.375% |  |  |
Maximum [Member] | Eurodollar Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letter of Credit, Fee Percentage |  |  |  |  | 2.50% |  |  |
Maximum [Member] | Senior Secured Credit Facility [Member] | Letters Of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letters of credit, outstanding amount |  | 100,000,000 |  |  | $ 100,000,000 |  |  |
Maximum [Member] | Alternate Base Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letter of Credit, Fee Percentage |  |  |  |  | 1.50% |  |  |
Petroleum Products [Member] | Senior Secured Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, amount outstanding |  | $ 34,500,000 |  |  | $ 34,500,000 |  |  |

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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 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) -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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