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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 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 since December 31, 2 012:
| 2013
Balance as of January 1, 2013 | 54,268,915 |
Common stock issued under DRIP | 509,831 |
Common stock issued under ATM program | 180,986 |
Common stock issued or redeemed under stock and incentive plans | 270,158 |
Common stock forfeited for tax withholding on share-based compensation | (52,385 | )
Common stock repurchased during the period (weighted average price of $7.94 per share) | (751,456 | )
Balance as of September 30, 2013 | 54,426,049 |
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 |  | Nine Months Ended
| September 30, |  | September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Restricted stock outstanding as of beginning of period | 526,803 |  |  | 454,117 |  |  | 448,283 |  |  | 365,506 |
Restricted stock granted | — |  |  | — |  |  | 255,158 |  |  | 220,821 |
Restricted stock vested | (2,917 | ) |  | (2,917 | ) |  | (179,555 | ) |  | (135,127 | )
Restricted stock outstanding as of end of period | 523,886 |  |  | 451,200 |  |  | 523,886 |  |  | 451,200 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated other comprehensive income as of September 30, 2013 and December 31, 2012 is comprised of the following items:
| September 30, 2013 |  | December 31, 2012
Available for sale investments: |  |  |
Unrealized gains | $ | 49,669 |  |  | $ | 104,869 |
Unrealized losses | (72,057 | ) |  | (12,623 | )
| (22,388 | ) |  | 92,246 |
Hedging instruments: |  |  |  |  |
Unrealized gains | 3,779 |  |  | — |
Unrealized losses | (15,754 | ) |  | (39,735 | )
| (11,975 | ) |  | (39,735 | )
Accumulated other comprehensive income | $ | (34,363 | ) |  | $ | 52,511 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 + Details
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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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