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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 At the market progam [Member] | Mar. 31, 2013 At the market progam [Member] | Mar. 31, 2014 Series A Preferred Stock [Member] | Dec. 31, 2013 Series A Preferred Stock [Member] | Mar. 31, 2014 Series B Preferred Stock [Member] | Dec. 31, 2013 Series B Preferred Stock [Member] | Mar. 31, 2014 Common Stock [Member] At the market progam [Member] | Mar. 31, 2014 Restricted Stock [Member] | Mar. 31, 2014 Four to five years [Member] Restricted Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonvested restricted stock, fair value remaining to be amortized |  |  |  |  |  |  |  |  |  | $ 6,092 | $ 541
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 8.50% |  | 7.625% |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 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 at beginning of period | 54,310,484 | 54,268,915 |  |  |  |  |  |  |  |  |
Common stock issued under DRIP | 3,938 | 298,304 |  |  |  |  |  |  |  |  |
Common stock issued under ATM program |  |  | 0 | 180,986 |  |  |  |  |  |  |
Common stock issued or redeemed under Stock and Incentive Plans | 442,035 | 139,600 |  |  |  |  |  |  |  |  |
Common stock forfeited for tax withholding on share-based compensation | (59,150) | (52,385) |  |  |  |  |  |  |  |  |
Balance at end of period | 54,697,307 | 54,835,420 |  |  |  |  |  |  |  |  |
ATM program, authorized shares remaining |  |  |  |  |  |  |  |  | 7,416,520 |  |
Dividend reinvestment plan, shares authorized | 3,000,000 |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.25 |  |  |  |  |  |  |  |  |  |
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 | 2,462,960 |  |  |  |  |  |  |  |  |  |

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