| In millions, except per share items | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 | Dec-31-08 | Dec-31-07 | Dec-31-06 | Dec-31-05 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Operating activities | | | | | | | | |
| Net income (loss) | -1.7 | -1.8 | -13.1 | | -23.2 | -2.5 | 7.2 | 5.1 |
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| Adjustments to reconcile net income (loss) to cash from operating activities: | | | | | | | | |
| Depreciation and amortization | 48.7 | 49.5 | 48.5 | | 54.3 | 47.9 | 25.7 | 10.5 |
| Stock based compensation | 3.2 | 2.8 | 2.5 | | 2.0 | 1.6 | 2.6 | 2.2 |
| Loss on investments | 14.2 | -2.1 | 7.9 | -10.9 | 3.7 | 0.4 | 0.9 | |
| (Gain) on extinguishment of debt, net | -10.8 | -15.2 | 0.3 | | -1.7 | -1.4 | | |
| Non-controlling interest in consolidated subsidiaries | 0.0 | 0.0 | -0.1 | | | | | |
| Straight-lining of rents | 6.2 | -1.9 | -4.2 | | | | | |
| Amortization of discounts/premiums, and origination fees/costs, net | -0.5 | -0.5 | -0.6 | | | | | |
| Amortization of debt issuance costs, leasing commissions and fair market value of debt issued or assumed | 2.6 | 2.3 | 2.8 | | | | | |
| Changes in operating assets and liabilities: | | | | | | | | |
| Other assets | -14.6 | 0.8 | -0.4 | | 11.9 | -7.8 | 1.5 | -27.1 |
| Accounts payable and other liabilities | 10.6 | -3.7 | 2.4 | -0.1 | | | | |
| Net cash provided by operating activities | 57.1 | 47.8 | 47.7 | 57.4 | 64.4 | 30.9 | 27.4 | -17.1 |
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| Investing activities | | | | | | | | |
| Principal received from borrowers | 7.0 | 10.0 | 11.2 | | | | | |
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| Repayments of commercial mortgage-backed securities | | | | | | | | |
| Purchases of real estate investments | -167.7 | -22.8 | -33.5 | | | | | |
| Leasing commission costs | -3.6 | -0.2 | -1.3 | | | | | |
| Purchases of furniture, fixtures, equipment and leasehold improvements | 0.0 | 0.0 | 0.0 | 0.0 | | | | |
| Net cash used in investing activities | -193.6 | 119.6 | -25.1 | 70.3 | 9.5 | -309.1 | -361.9 | -675.4 |
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| Financing activities | | | | | | | | |
| Borrowings from mortgages on real estate investments | | | | | | | | |
| Repayments on secured debt | | | | | | | | |
| Debt issuance costs | -4.0 | -1.0 | -0.8 | 0.6 | -1.8 | -4.7 | -1.3 | -7.1 |
| Common stock issued, net of offering costs | 32.2 | 54.3 | 25.1 | 11.0 | | | | |
| Common stock repurchased | | -6.7 | | | | -15.0 | | |
| Preferred stock issued, net of offering costs | 77.6 | | 40.2 | | | | | |
| Distributions to noncontrolling interest | 0.0 | 0.0 | 0.0 | 0.0 | | | | |
| Dividends paid on common and preferred stock | -26.2 | -22.8 | -19.0 | | | | | |
| Net cash provided by financing activities | 95.5 | -129.0 | -28.4 | -97.6 | -99.5 | 307.7 | 319.5 | 681.1 |
| Net increase (decrease) in cash and cash equivalents | -41.0 | 38.4 | -5.8 | 30.1 | -25.6 | 29.6 | -14.9 | -11.4 |
| Cash and cash equivalents at beginning of period | 71.2 | 32.7 | 38.5 | 8.4 | 34.0 | 4.4 | 19.3 | 30.7 |
| Cash and cash equivalents at end of period | 30.2 | 71.2 | 32.7 | 38.5 | 8.4 | 34.0 | 4.4 | 19.3 |
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| Supplemental disclosure of cash flow information | | | | | | | | |
| Cash paid for interest expense | 66.3 | 76.4 | 81.0 | 86.3 | | | | |
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| Capitalized interest on development properties | | | | | | | | |
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| Dividends/distributions declared but not paid | | | | | | | | |
| Supplemental disclosure of noncash operating, investing and financing information | | | | | | | | |
| Value of leases acquired | | | | | | | | |