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Subsequent Events (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Subsequent Event [Line Items] |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 4,487,060 |  |
Common shares issued | 178,616,664 | 154,938,351 |
Proceeds from issuance of common shares | $ 162,747,000 | $ 99,730,000 | $ 166,652,000
Settlement of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 5,049,096 |  |
Refinancing of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt Instrument, Amount Amended | 255,000,000 |  |
Suwanee, Georgia [Member] | Settlement of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt conversion, original debt, amount | 10,964,000 |  |
Six Percent Convertible Guaranteed Note [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt conversion, original debt, amount | 31,104,000 |  |
Debt Conversion, Converted Instrument, Amount | 31,104,000 |  |
Debt Conversion, Converted Instrument, Cash Payment During Conversion | 2,427,000 |  |
Debt instrument amount | 83,896,000 |  | 115,000,000
Six Percent Convertible Guaranteed Note [Member] | Settlement of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt Conversion, Converted Instrument, Amount | 35,000,000 |  |
Debt Conversion, Converted Instrument, Cash Payment During Conversion | 2,275,000 |  |
Secured Revolving Credit Facility [Member] | Refinancing of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Amount Refinanced | 300,000,000 |  |
Unsecured Term Loan [Member] | Refinancing of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument amount | 250,000,000 |  |
Debt Instrument, Term | 5 years |  |
Unsecured Revolving Credit Facility, Expiring February 2017 [Member] | Refinancing of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument amount | 300,000,000 |  |
Minimum [Member] | Unsecured Term Loan [Member] | Refinancing of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Basis spread on variable rate | 1.45% |  |
Minimum [Member] | Unsecured Revolving Credit Facility, Expiring February 2017 [Member] | Refinancing of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Basis spread on variable rate | 1.50% |  |
Maximum [Member] | Unsecured Term Loan [Member] | Refinancing of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Basis spread on variable rate | 2.00% |  |
Maximum [Member] | Unsecured Revolving Credit Facility, Expiring February 2017 [Member] | Refinancing of Debt [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Basis spread on variable rate | 2.05% |  |
At The Market [Member] | Issuance of Equity [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Common shares, authorized shares (in shares) | 100,000,000 |  |
Common shares issued | 3,409,927 |  |
Proceeds from issuance of common shares | $ 36,884,000 |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
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