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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  | 3 Months Ended |
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Mar. 31, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) | Mar. 31, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Mutual funds | Mar. 31, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Common stocks | Mar. 31, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Other | Mar. 31, 2013 Fair value measurement on a recurring basis Significant Other Observable Inputs (Level 2) | Mar. 31, 2013 Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3) | Mar. 31, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value | Mar. 31, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Mutual funds | Mar. 31, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Common stocks | Mar. 31, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Other
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities in deferred compensation plan |  |  |  |  |  | $ 6,606 | $ 239 | $ 213 |  |  |  |  |  | $ 6,606 | [1] | $ 239 | [1] | $ 213 | [1]
Common stocks |  |  |  | 743 | [1] |  |  |  |  |  |  | 743 | [1] |  |  |  |  |  |
Interest rate derivatives | (5,080) | (6,185) |  |  |  |  |  |  | 260 | [2] |  | 260 | [2] |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  | 420 | [2] |  | 420 | [2] |  |  |  |  |  |
Assets |  |  |  | 7,801 |  |  |  |  | 680 |  |  | 8,481 |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan liability |  |  |  | 7,058 | [3] |  |  |  | 0 | [3] |  | 7,058 | [3] |  |  |  |  |  |
Interest rate derivatives | 5,340 | 6,185 |  |  |  |  |  |  | 5,340 |  |  | 5,340 |  |  |  |  |  |  |
Liabilities |  |  |  | 7,058 |  |  |  |  | 5,340 |  |  | 12,398 |  |  |  |  |  |  |
Redeemable noncontrolling interest | $ 10,356 | $ 10,298 | $ 9,237 |  |  |  |  |  |  |  | $ 10,356 | $ 10,356 |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  | 15.50% |  |  |  |  |  |  |  |
[1] | Included in the line entitled “restricted cash and marketable securities” on our consolidated balance sheet.
[2] | Included in the line entitled “prepaid expenses and other assets” on our consolidated balance sheet.
[3] | Included in the line entitled “other liabilities” on our consolidated balance sheet.

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