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Property Transactions Property Transactions (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 6 Months Ended |  | 3 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended |  | 9 Months Ended |  |  | 3 Months Ended |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013 816 Congress [Member] | Apr. 25, 2013 816 Congress [Member] sqft | Sep. 30, 2013 Terminus Two Hundred LLC [Member] | Feb. 28, 2013 Terminus Office Holdings [Member] | Sep. 30, 2013 Terminus Office Holdings [Member] | Sep. 30, 2013 Terminus Office Holdings [Member] | Sep. 30, 2013 Terminus One Hundred LLC [Member] | Sep. 30, 2013 Post Oak Central [Member] | Feb. 28, 2013 Post Oak Central [Member] sqft | Feb. 28, 2013 MSREF Terminus Two Hundred LLC [Member] Terminus Two Hundred LLC [Member] | Sep. 30, 2013 Texas Acquisition [Member] | Jul. 29, 2013 Texas Acquisition [Member] | Jul. 19, 2013 Texas Acquisition [Member] | Jul. 19, 2013 Texas Acquisition [Member] Houston, Texas [Member] sqft | Jul. 19, 2013 Texas Acquisition [Member] Fort Worth, Texas [Member] sqft | Sep. 30, 2013 Term Loan [Member] | Jul. 29, 2013 Term Loan [Member] Texas Acquisition [Member]
Real Estate, Write-down or Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Document Fiscal Year Focus |  |  | 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage of Partner in Joint Venture |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  | 80.00% |  |  |  |  |  |  |
Outstanding Amount of Mortgage Note Payable of Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 74,600,000 |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  | 19,700,000 |  |  |  | 37,100,000 |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate Held-for-investment |  |  | 171,779,000 | 73,052,000 |  |  |  | 112,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | 342,000 |  |  |  | 122,000 |  |  | 231,000 |  |  | 4,200,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | 82,000,000 | 82,000,000 |  |  |  |  |  |  |  |  |  |  | 950,000,000
Debt Instrument, Face Amount, Extension One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |
Proceeds from Equity Method Investment, Dividends or Distributions |  |  | 65,563,000 | 12,065,000 |  |  |  |  |  | 39,200,000 |  |  |  |  |  |  |  |  |  |  |
Square Footage of Real Estate Property |  |  |  |  |  | 435,000 |  |  |  |  |  |  | 1,300,000.0 |  |  |  |  | 4,300,000 | 980,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  |  | 102,400,000 |  |  |  |  |  |  | 230,900,000 | 53,800,000 |  |  | 1,100,000,000 |  |  |  |
Gains (Losses) on Extinguishment of Debt | $ 0 | $ 0 | $ 0 | $ (94,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,600,000 |

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