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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 54,268,915 |  |  |  | 40,382,530 |  |  |  |  | 54,268,915 | 40,382,530 |
Common stock issued under DRIP |  |  |  |  |  |  |  |  |  |  |  |  | 515,257 | 13,480 |
Common stock issued or redeemed under Stock and Incentive Plans |  |  |  |  |  |  |  |  |  |  |  |  | 270,158 | 241,663 |
Common stock forfeited for tax withholding on share-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | (52,385) |  |
Stock Repurchased During Period, Shares |  |  |  |  |  |  |  |  |  |  |  |  | (872,447) | (104,000) |
Balance at end of period | 54,310,484 |  |  |  | 54,268,915 |  |  |  | 40,382,530 |  |  |  | 54,310,484 | 54,268,915 | 40,382,530
Dividend reinvestment plan, shares authorized | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Dividends declared per common share | $ 0.27 | $ 0.27 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.28 | $ 0.28 | $ 0.27 | $ 0.27 | $ 0.27 | $ 1.1200 | $ 1.1500 | $ 1.0900
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 42,145 |  |
Stock issued during period, remaining shares available, dividend reinvestment plan | 2,466,898 |  |  |  |  |  |  |  |  |  |  |  | 2,466,898 |  |
At the market progam [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued under ATM program |  |  |  |  |  |  |  |  |  |  |  |  | 180,986 | 402,494 |
Secondary offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued under ATM program |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,332,748 |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued | 2,300,000 |  |  |  | 2,300,000 |  |  |  |  |  |  |  | 2,300,000 | 2,300,000 |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 7.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued | 2,250,000 |  |  |  | 0 |  |  |  |  |  |  |  | 2,250,000 | 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 by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | 27,500 |  |  |  |  |  |  |  |  |  |  |  | 27,500 |  |
Share-based compensation arrangement other than option, vested and outstanding, price per share | $ 7.06 |  |  |  |  |  |  |  |  |  |  |  | $ 7.06 |  |
Ordinary income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.0650 | $ 1.0038 | $ 0.9822
Capital Gain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0550 | $ 0.1462 | $ 0.1078

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