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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2014
Fair Value Measurements |
Recurring Fair Value Measurements |
|  | Fair Value as of December 31, 2014 |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
|  | (In thousands) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale equity securities from energy industry |  | $ | 35,002 |  | $ | — |  | $ | — |  | $ | 35,002 |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-CMO debt securities |  |  | — |  |  | 18 |  |  | — |  |  | 18 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total short-term investments |  | $ | 35,002 |  | $ | 18 |  | $ | — |  | $ | 35,020 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair Value of Financial Instruments |
|  | As of December 31, |
|  | 2014 |  | 2013 |
|  | Effective Interest Rate |  | Carrying Value |  | Fair Value |  | Effective Interest Rate |  | Carrying Value |  | Fair Value |
|  | (In thousands, except interest rates) |
2.35% senior notes due September 2016 |  |  | 2.56 | % | $ | 349,887 |  | $ | 346,980 |  |  | 2.56 | % | $ | 349,820 |  | $ | 354,694 |
6.15% senior notes due February 2018 |  |  | 6.42 | % |  | 930,693 |  |  | 991,920 |  |  | 6.42 | % |  | 969,928 |  |  | 1,097,480 |
9.25% senior notes due January 2019 |  |  | 9.33 | % |  | 339,607 |  |  | 403,531 |  |  | 9.33 | % |  | 339,607 |  |  | 428,733 |
5.00% senior notes due September 2020 |  |  | 5.20 | % |  | 698,253 |  |  | 687,953 |  |  | 5.20 | % |  | 697,947 |  |  | 731,955 |
4.625% senior notes due September 2021 |  |  | 4.75 | % |  | 698,388 |  |  | 661,619 |  |  | 4.75 | % |  | 698,148 |  |  | 709,793 |
5.10% senior notes due September 2023 |  |  | 5.26 | % |  | 348,893 |  |  | 332,759 |  |  | 5.26 | % |  | 348,765 |  |  | 349,731 |
Subsidiary preferred stock |  |  | 0.00 | % |  | — |  |  | — |  |  | 4.00 | % |  | 69,188 |  |  | 69,000 |
Revolving credit facility |  |  | 3.47 | % |  | 450,000 |  |  | 450,000 |  |  | 2.28 | % |  | 170,000 |  |  | 170,000 |
Commercial paper |  |  | 0.59 | % |  | 533,119 |  |  | 533,119 |  |  | 0.45 | % |  | 329,844 |  |  | 329,844 |
Other |  |  | 0.00 | % |  | 6,209 |  |  | 6,209 |  |  | 0.00 | % |  | 10,243 |  |  | 10,243 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  |  |  | $ | 4,355,049 |  | $ | 4,414,090 |  |  |  |  | $ | 3,983,490 |  | $ | 4,251,473 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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