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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  | 54,268,915 |  |
Common stock issued under DRIP |  |  | 509,831 |  |
Common stock issued or redeemed under Stock and Incentive Plans |  |  | 270,158 |  |
Common stock forfeited for tax withholding on share-based compensation |  |  | (52,385) |  |
Stock Repurchased During Period, Shares |  |  | 751,456 |  |
Balance at end of period | 54,426,049 |  | 54,426,049 |  |
Dividend reinvestment plan, shares authorized | 3,000,000 |  | 3,000,000 |  |
Dividends declared per common share | $ 0.27 | $ 0.29 | $ 0.85 | $ 0.86 |
Additional Paid in Capital [Abstract] |  |  |  |  |
Additional Paid in Capital, Common Stock beginning of period |  |  | $ 759,214 |  |
Additional Paid In Capital from DRIP issuances of common stock |  |  | 5,401 |  |
Adjustments related to tax withholding for share-based compensation |  |  | 545 |  |
Stock Repurchased During Period, Value |  |  | (5,956) |  |
Amortization of restricted stock, net of additional grants |  |  | 1,736 |  |
Additional Paid in Capital, Capitalized expenses |  |  | (89) |  |
Additional Paid in Capital, Common Stock, end of period | 761,862 |  | 761,862 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |
Accumulated other comprehensive income, available-for-sale securities, gross unrealized gains | 49,669 |  | 49,669 |  | 104,869
Accumulated other comprehensive income, available-for-sale securities, gross unrealized losses | (72,057) |  | (72,057) |  | (12,623)
Accumulated other comprehensive income from available-for-sale securities, net unrealized gain | (22,388) |  | (22,388) |  | 92,246
Accumulated Other Comprehensive Income (Loss), Unrealized Gains from Cash Flow Hedges, Effect Net of Tax | 3,779 |  | 3,779 |  | 0
Accumulated other comprehensive income from hedging instruments, unrealized losses | (15,754) |  | (15,754) |  | (39,735)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | (11,975) |  | (11,975) |  | (39,735)
Accumulated other comprehensive income | (34,363) |  | (34,363) |  | 52,511
Stock Repurchase Program, Authorized Amount |  |  | 50,000 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | 43,115 |  |
Stock issued during period, remaining shares available, dividend reinvestment plan | 2,472,324 |  | 2,472,324 |  |
At the market progam [Member] |  |  |  |  |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |
Common stock issued under ATM program |  |  | 180,986 |  |
Additional Paid in Capital [Abstract] |  |  |  |  |
Additional Paid in Capital from ATM issuances of common stock |  |  | 1,954 |  |
Stock Compensation Plan [Member] |  |  |  |  |
Additional Paid in Capital [Abstract] |  |  |  |  |
Additional Paid in Capital from ATM issuances of common stock |  |  | $ 147 |  |
Series A Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 0.53125 |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 8.50% |  |  |  |
Preferred Stock, Shares Issued | 2,300,000 |  | 2,300,000 |  | 2,300,000
Preferred Stock, Par Value Per Share | $ 0.01 |  | $ 0.01 |  | $ 0.01
Series B Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 0.4765625 |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 7.625% |  |  |  |
Preferred Stock, Shares Issued | 2,250,000 |  | 2,250,000 |  | 0
Preferred Stock, Par Value Per Share | $ 0.01 |  | $ 0.01 |  | $ 0
Common Stock [Member] | At the market progam [Member] |  |  |  |  |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |
ATM program, authorized shares remaining | 7,416,520 |  | 7,416,520 |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share-based compensation arrangement other than option, vested and outstanding, price per share | $ 7.06 |  | $ 7.06 |  |

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration