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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Assets: |  |
Fair value of available-for-sale securities | $ 17,320 | $ 27,679
Cost Method Investments, Fair Value Disclosure | 2,475 | 2,475
Interest rate Cap | 0 |
Derivative Asset, Number of Instruments Held | 1 | 1
Liabilities: |  |
Interest rate swaps | 5,529 | 5,805
Derivative Liability, Number of Instruments Held | 4 | 4
Long-term Debt, Fair Value | 4,969,289 | 5,058,411
Available-for-sale Securities, Debt Maturities, Date | Oct. 01, 2028 |
Assumed Reduction In Cash Flows Used To Calculate Fair Value Of Cost Method Investment | 0% to 10% |
Assumed Capitalization Rate Range in Determining Fair Value | 10% to 12% |
Discount Rate Used To Calculate Fair Value Of Privately Held Debt And Equity Securities | 20.00% |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Fair value of available-for-sale securities | 17,320 | 16,556
Cost Method Investments, Fair Value Disclosure | 0 | 0
Interest rate Cap | 0 |
Liabilities: |  |
Interest rate swaps | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Fair value of available-for-sale securities | 0 | 0
Cost Method Investments, Fair Value Disclosure | 0 | 0
Interest rate Cap | 0 |
Liabilities: |  |
Interest rate swaps | 5,529 | 5,805
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Fair value of available-for-sale securities | 0 | 11,123
Cost Method Investments, Fair Value Disclosure | 2,475 | 2,475
Interest rate Cap | 0 |
Liabilities: |  |
Interest rate swaps | $ 0 | $ 0

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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 fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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