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Unsecured Lines Of Credit Payable | 12 Months Ended
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Dec. 31, 2012
Unsecured Debt [Abstract] |
Unsecured Lines Of Credit Payable | UNSECURED LINES OF CREDIT PAYABLE As of December 31, 2012, we maintained a $100.0 million unsecured line of credit maturing in June 2015 (“Credit Facility No. 1”) and a $400.0 million unsecured line of credit maturing in July 2016 (“Credit Facility No. 2”). Credit Facility No. 1 and No. 2 have accordion features that allow us to increase the facilities to $200.0 million and $600.0 million, respectively, subject to additional lender commitments. The amounts of these lines of credit unused and available at December 31, 2012 were as follows (in thousands):
| Credit Facility No. 1 |  | Credit Facility No. 2
Committed capacity | $ | 100,000 |  |  | $ | 400,000 |
Borrowings outstanding | — |  |  | — |
Letters of credit issued | (815 | ) |  | — |
Unused and available | $ | 99,185 |  |  | $ | 400,000 |
We executed borrowings and repayments on the unsecured lines of credit during 2012 as follows (in thousands):
| Credit Facility No. 1 |  | Credit Facility No. 2
Balance at December 31, 2011 | $ | 74,000 |  |  | $ | 25,000 |
Borrowings | — |  |  | 158,000 |
Repayments | (74,000 | ) |  | (183,000 | )
Balance at December 31, 2012 | $ | — |  |  | $ | — |
We made borrowings to repay our 5.05% unsecured notes, to partially fund the acquisition of Fairgate at Ballston, to repay the mortgage note secured by Frederick Crossing and for general corporate purposes. We made repayments during the year ended December 31, 2012 using proceeds from the issuance of our 3.95% unsecured notes and the sale of 1700 Research Boulevard. Borrowings under Credit Facility No. 1 and No. 2 bear interest at LIBOR plus a spread based on the credit rating on our publicly issued debt. The interest rate spread is 120 basis points for each facility. All outstanding advances for Credit Facility No. 1 and No. 2 are due and payable upon maturity in June 2015 and July 2016, respectively. Credit Facility No. 1 and No. 2 may be extended for one year at our option. Interest only payments are due and payable generally on a monthly basis. For the three years ended December 31, 2012, we recognized interest expense (excluding facility fees) as follows (in thousands):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Credit Facility No. 1 | $ | 470 |  |  | $ | 355 |  |  | $ | 91 |
Credit Facility No. 2 | 783 |  |  | 2,735 |  |  | 2,684 |
In addition, we pay a facility fee based on the credit rating of our publicly issued debt which as of December 31, 2012 equals 0.25% per annum of the committed capacity of each facility, without regard to usage. Rates and fees may be adjusted up or down based on changes in our senior unsecured credit ratings. For the three years ended December 31, 2012, we incurred facility fees as follows (in thousands):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Credit Facility No. 1 | $ | 175 |  |  | $ | 114 |  |  | $ | 114 |
Credit Facility No. 2 | 887 |  |  | 658 |  |  | 398 |
Credit Facility No. 1 and No. 2 contain certain financial and non-financial covenants, all of which we have met as of December 31, 2012 and 2011. Included in these covenants is the requirement to maintain a minimum level of net worth, as well as limits on our total liabilities, secured indebtedness and required debt service payments. Information related to revolving credit facilities for the three years ended December 31, 2012 as follows (in thousands, except percentage amounts):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Total revolving credit facilities at December 31 | $ | 500,000 |  |  | $ | 475,000 |  |  | $ | 337,000 |
Borrowings outstanding at December 31 | — |  |  | 99,000 |  |  | 100,000 |
Weighted average daily borrowings during the year | 108,589 |  |  | 160,090 |  |  | 112,573 |
Maximum daily borrowings during the year | 242,000 |  |  | 281,000 |  |  | 141,000 |
Weighted average interest rate during the year | 1.15 | % |  | 1.90 | % |  | 2.43 | %
Weighted average interest rate on borrowings outstanding at December 31 | n/a |  |  | 0.90 | % |  | 2.53 | %

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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