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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2013
Equity [Abstract] |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] | The following table presents a summary of the changes in the number of common shares outstanding for the periods presented:
| 2013 |  | 2012
Balance as of January 1, | 54,268,915 |  |  | 40,382,530 |
Common stock issued under DRIP | 515,257 |  |  | 13,480 |
Common stock issued under ATM program | 180,986 |  |  | 402,494 |
Common stock issued or redeemed under stock and incentive plans | 270,158 |  |  | 241,663 |
Common stock issued via public offering | — |  |  | 13,332,748 |
Common stock forfeited for tax withholding on share-based compensation | (52,385 | ) |  | — |
Common stock repurchased during the period (weighted average price of $8.09 and $8.86 per share, respectively) | (872,447 | ) |  | (104,000 | )
Balance as of December 31, | 54,310,484 |  |  | 54,268,915 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | The following table presents a rollforward of the restricted stock activity for the periods indicated:
| Year Ended
| December 31,
| 2013 |  | 2012
Restricted stock outstanding as of beginning of period | 448,283 |  |  | 365,506 |
Restricted stock granted | 255,158 |  |  | 220,821 |
Restricted stock vested | (182,472 | ) |  | (138,044 | )
Restricted stock outstanding as of end of period | 520,969 |  |  | 448,283 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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