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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2012
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 indicated:
| 2012 |  | 2011
Balance as of January 1, | 40,382,530 |  |  | 30,342,897 |
Common stock issued under ATM program | 402,494 |  |  | 409,237 |
Common stock issued under DRIP | 13,480 |  |  | 4,365 |
Common stock issued via public offering | 13,332,748 |  |  | 9,200,000 |
Common stock issued or redeemed under stock and incentive plans | 241,663 |  |  | 426,031 |
Common stock repurchased | (104,000 | ) |  | — |
Balance as of December 31, | 54,268,915 |  |  | 40,382,530 |
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 presented:
| 2012 |  | 2011
Restricted stock outstanding at January 1, | 365,506 |  |  | 25,000 |
Restricted stock granted | 220,821 |  |  | 358,006 |
Restricted stock vested | (138,044 | ) |  | (17,500 | )
Restricted stock outstanding at December 31, | 448,283 |  |  | 365,506 |
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block] | The following table presents a rollforward of the SARs activity for the periods presented:
| 2012 |  | 2011
| Quantity | Weighted-Average Price |  | Quantity | Weighted-Average Price
SARs outstanding at January 1, | 59,375 |  | $ | 6.87 |  |  | 136,875 |  | $ | 7.31 |
SARs exercised | (31,875 | ) | 6.71 |  |  | (77,500 | ) | 7.64 |
SARs outstanding at December 31, | 27,500 |  | $ | 7.06 |  |  | 59,375 |  | $ | 6.87 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The Company has not granted any stock options since the year ended December 31, 2008, and the compensation cost related to all stock options has been expensed in prior periods. All outstanding stock options as of December 31, 2012 will expire by May 16, 2013. The following table presents a rollforward of the stock option activity for the periods presented:
| 2012 |  | 2011
| Quantity | Weighted-Average Price |  | Quantity | Weighted-Average Price
Stock options outstanding at January 1, | 30,000 |  | $ | 9.42 |  |  | 45,000 |  | $ | 8.75 |
Stock options expired | (10,000 | ) | 9.02 |  |  | — |  | — |
Stock options exercised | (5,000 | ) | 9.02 |  |  | (15,000 | ) | 7.43 |
Stock options outstanding at December 31, | 15,000 |  | $ | 9.81 |  |  | 30,000 |  | $ | 9.42 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated other comprehensive income as of December 31, 2012 and December 31, 2011 is comprised of the following items:
| December 31, 2012 |  | December 31, 2011
Available for sale investments: |  |  |
Unrealized gains | $ | 104,870 |  |  | $ | 36,091 |
Unrealized losses | (12,623 | ) |  | (13,902 | )
| 92,247 |  |  | 22,189 |
Hedging instruments: |  |  |  |  |
Unrealized losses | (39,736 | ) |  | (25,444 | )
| (39,736 | ) |  | (25,444 | )
Accumulated other comprehensive income (loss) | $ | 52,511 |  |  | $ | (3,255 | )

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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