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Shareholders' Equity (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Aug. 01, 2012 | Dec. 31, 2011 | Sep. 30, 2012 At the market progam/ATM [Member] | Sep. 30, 2012 Secondary offering [Member] | Sep. 30, 2012 Common Stock [Member] | Sep. 30, 2011 Common Stock [Member] | Sep. 30, 2012 Common Stock [Member] At the market progam/ATM [Member] | Sep. 30, 2012 Common Stock [Member] At the market progam/ATM [Member] | Sep. 30, 2011 Common Stock [Member] At the market progam/ATM [Member] | Sep. 30, 2012 Common Stock [Member] Secondary offering [Member] | Sep. 30, 2011 Common Stock [Member] Secondary offering [Member] | Sep. 30, 2012 Common Stock [Member] Option Exercised by Underwriter [Member] | Aug. 01, 2012 Nonrecognized Subsequent Event [Member] | Aug. 06, 2012 Nonrecognized Subsequent Event [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued | 2,300,000 |  | 2,300,000 |  |  | 0 |  |  |  |  |  |  |  |  |  |  | 2,300,000 |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.50%
Preferred Stock, Par or Stated Value Per Share | $ 0.01 |  | $ 0.01 |  | $ 0.01 | $ 0.00 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,689,000 |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  | 40,382,530 |  |  |  |  |  | 40,382,530 | 30,342,897 |  |  |  |  |  |  |  |
Common Stock Issued |  |  |  |  |  |  |  |  |  |  | 0 | 402,494 | 409,237 | 13,332,748 | 9,200,000 | 832,487 |  |
Common stock issued under DRIP |  |  |  |  |  |  |  |  | 9,279 | 2,111 |  |  |  |  |  |  |  |
Common stock issued or redeemed under Stock and Incentive Plans |  |  |  |  |  |  |  |  | 241,663 | 426,031 |  |  |  |  |  |  |  |
Balance at end of period | 54,368,714 |  | 54,368,714 |  |  |  |  |  | 54,368,714 | 40,380,276 |  |  |  |  |  |  |  |
Equity Placement Program, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  | 123,832,000 | 95,261,000 |  |  |  |  |  |  |  | 3,721 |  | 119,992 |  |  |  |
Sales Commissions and Fees |  |  |  |  |  |  |  |  |  |  |  | 57 |  |  |  |  |  |
Equity Placement Program, Shares Sold, Average Price per Share |  |  |  |  |  |  |  |  |  |  |  | $ 9.39 |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.29 | $ 0.27 | $ 0.86 | $ 0.81 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, New Issues, Price per Share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.12 |  |  |  |
Additional Paid in Capital [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of January 1, 2012 | 759,647,000 |  | 759,647,000 |  |  | 634,683,000 |  |  |  |  |  |  |  |  |  |  |  |
DRIP issuances |  |  | 90,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  | 3,674,000 | 119,859,000 |  |  |  |  |  |  |  |  |  |
Incentive plans |  |  | 192,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of restricted stock |  |  | 1,268,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized expenses |  |  | (119,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of September 30, 2012 | 759,647,000 |  | 759,647,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities, gross unrealized gains | 110,332,000 |  | 110,332,000 |  |  | 36,091,000 |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Gross Unrealized Losses | (10,747,000) |  | (10,747,000) |  |  | (13,902,000) |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 99,585,000 |  | 99,585,000 |  |  | 22,189,000 |  |  |  |  |  |  |  |  |  |  |  |
Hedging Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion | (43,695,000) |  | (43,695,000) |  |  | (25,444,000) |  |  |  |  |  |  |  |  |  |  |  |
Hedging Instruments, Gain (loss) in accumulated other comprehensive (loss) income | (43,695,000) |  | (43,695,000) |  |  | (25,444,000) |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive (loss) income | $ 55,890,000 |  | $ 55,890,000 |  |  | $ (3,255,000) |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 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.(d)(1)) -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 02 -Paragraph 29 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4, 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 + Details
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