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Shareholders' Equity Schedule of Additional Paid-In Capital (Tables) | 9 Months Ended
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Sep. 30, 2013
Additional Paid in Capital [Abstract] |
Schedule of Additional Paid in Capital [Table Text Block] | Additional Paid-In Capital The following table presents a rollforward of the Company's changes in additional paid-in capital since December 31, 2012:
| 2013
Balance as of January 1, 2013 | $ | 759,214 |
Common stock issuances: |
DRIP issuances | 5,401 |
ATM issuances | 1,954 |
Incentive plans | 147 |
Adjustments related to tax withholding for share-based compensation | (545 | )
Common stock repurchases | (5,956 | )
Amortization of restricted stock, net of additional grants | 1,736 |
Capitalized expenses | (89 | )
Balance as of September 30, 2013 | $ | 761,862 |

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