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Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2014
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:
| Three Months Ended
| March 31,
| 2014 |  | 2013
Balance as of beginning of period | 54,310,484 |  |  | 54,268,915 |
Common stock issued under DRIP | 3,938 |  |  | 298,304 |
Common stock issued under ATM program | — |  |  | 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 as of end of period | 54,697,307 |  |  | 54,835,420 |
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:
| Three Months Ended
| March 31,
| 2014 |  | 2013
Restricted stock outstanding as of beginning of period | 520,969 |  |  | 448,283 |
Restricted stock granted | 428,363 |  |  | 139,600 |
Restricted stock vested | (188,620 | ) |  | (153,720 | )
Restricted stock outstanding as of end of period | 760,712 |  |  | 434,163 |

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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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