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Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Unamortized Debt Issuance Expense | $ 34,030 | $ 33,555 | [1]
Other noncurrent assets | 31,673 | 44,659 |
Assets, Noncurrent | 152,374 | 234,199 |
Assets | 5,621,643 | 6,483,145 |
Senior Notes | 2,315,970 | 2,166,445 | [1]
Liabilities, Noncurrent | 3,466,717 | 3,411,830 |
Liabilities and Equity | $ 5,621,643 | 6,483,145 |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Unamortized Debt Issuance Expense |  | 33,600 |
Scenario, Previously Reported [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Other noncurrent assets |  | 78,214 |
Assets, Noncurrent |  | 267,754 |
Assets |  | 6,516,700 |
Senior Notes |  | 2,200,000 |
Liabilities, Noncurrent |  | 3,445,385 |
Liabilities and Equity |  | $ 6,516,700 |
[1] | Prior period amounts have been reclassified to conform to the current period presentation on the accompanying balance sheets. Please refer to the section Recently Issued Accounting Standards in Note 1 – Summary of Significant Accounting Policies for additional discussion.

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