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Shareholders' Equity (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 25.00 | $ 25.00 |  |
Preferred Stock, Dividend Payment Terms | October 14, 2016 |  |  |
Balance as of beginning of period |  | 49,047,335 | 54,739,111 |
Common stock issued under DRIP |  | 15,714 | 16,862 |
Common stock issued under stock and incentive plans |  | 214,878 | 263,829.000 |
Common stock forfeited for tax withholding on share-based compensation |  | (80,888) | (67,296) |
Common stock repurchased during the period |  | (48,444) | (4,383,716) |
Balance as of end of period | 49,148,595 | 49,148,595 | 50,568,790 |
Dividend reinvestment plan, shares authorized | 3,000,000 | 3,000,000 |  |
Stock issued during period, remaining shares available, dividend reinvestment plan | 2,411,824 | 2,411,824 |  |
Dividends declared per common share | $ 0.21 |  |  |
Stock Repurchase Program, Authorized Amount | $ 50,000,000 | $ 50,000,000 |  |
Stock Repurchase Program Expiration Date |  | Dec. 31, 2016 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 8,518,000 | $ 8,518,000 |  |
Series A Preferred Stock |  |  |  |
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
Series B Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 7.625% |  |
Preferred Stock, Shares Issued | 2,250,000 | 2,250,000 |  | 2,250,000
Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends Payable, Date of Record | Oct. 01, 2016 |  |  |
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends Payable, Date of Record | Oct. 05, 2016 |  |  |
Dividends Payable, Date to be Paid | Oct. 31, 2016 |  |  |
Common Stock | At the market progam [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
ATM program, authorized shares remaining | 7,416,520 | 7,416,520 |  |

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