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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 At the market progam [Member] | Jun. 30, 2013 At the market progam [Member] | Jun. 30, 2014 Series A Preferred Stock [Member] | Dec. 31, 2013 Series A Preferred Stock [Member] | Jun. 30, 2014 Series B Preferred Stock [Member] | Dec. 31, 2013 Series B Preferred Stock [Member] | Jun. 30, 2014 Common Stock [Member] At the market progam [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  | 8.50% |  | 7.625% |  |
Preferred Stock, Liquidation Preference Per Share | $ 25.00 |  | $ 25.00 |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  |  | 2,300,000 | 2,300,000 | 2,250,000 | 2,250,000 |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  | 54,310,484 | 54,268,915 |  |  |  |  |  |  |
Common stock issued under DRIP |  |  | 6,543 | 505,718 |  |  |  |  |  |  |
Common stock issued under ATM program |  |  |  |  | 0 | 180,986 |  |  |  |  |
Common stock issued or redeemed under stock and incentive Plans |  |  | 471,210 | 270,158 |  |  |  |  |  |  |
Common stock forfeited for tax withholding on share-based compensation |  |  | (59,150) | (52,385) |  |  |  |  |  |  |
Balance as of end of period | 54,729,087 | 55,173,392 | 54,729,087 | 55,173,392 |  |  |  |  |  |  |
Dividend reinvestment plan, shares authorized | 3,000,000 |  | 3,000,000 |  |  |  |  |  |  |  |
Stock issued during period, remaining shares available, dividend reinvestment plan | 2,460,355 |  | 2,460,355 |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.25 | $ 0.29 | $ 0.50 | $ 0.58 |  |  |  |  |  |  |
ATM program, authorized shares remaining |  |  |  |  |  |  |  |  |  |  | 7,416,520
Stock Repurchase Program, Authorized Amount |  |  | $ 50,000 |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 42 |  |  |  |  |  |  |  |

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