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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |
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Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Jun. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] | Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] | Jun. 30, 2013 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Cost-method Investments [Member] | Jun. 30, 2013 Cost-method Investments [Member] | Dec. 31, 2011 Cost-method Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Real Estate | $ 21,038 |  | $ 0 | $ 21,038 | $ 0 |  |  |  |  |  |  |  | $ 2,400 |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of available-for-sale securities | 16,304 |  |  | 16,304 |  | 27,679 | 16,304 | 16,556 | 0 | 0 | 0 | 11,123 |  |  |
Cost Method Investments, Fair Value Disclosure |  |  |  |  |  | 2,475 |  | 0 |  | 0 |  | 2,475 | 2,475 | 0 | 2,475
Derivative Asset, Number of Instruments Held | 1 |  |  | 1 |  | 1 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | 4,528 |  |  | 4,528 |  | 5,805 |  |  | 4,528 | 5,805 |  |  |  |  |
Derivative Liability, Number of Instruments Held | 4 |  |  | 4 |  | 4 |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value | $ 4,817,491 |  |  | $ 4,817,491 |  | $ 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% |  |  |  |  |  |  |  |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + 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=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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