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Schedule II (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | $ 4,903 | $ 6,672 | $ 5,951
Additions to allowance for doubtful accounts | 2,335 | 2,522 | 4,009
Deductions to allowance for doubtful accounts | (3,279) | (4,291) | (3,288)
Allowance for doubtful accounts, ending balance | 3,959 | 4,903 | 6,672
Allowance for Doubtful Accounts - Straight Line Rent [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | 1,294 | 2,209 | 2,443
Additions to allowance for doubtful accounts | 1,382 | 710 | 635
Deductions to allowance for doubtful accounts | (1,747) | (1,625) | (869)
Allowance for doubtful accounts, ending balance | 929 | 1,294 | 2,209
Allowance for Doubtful Accounts - Accounts Receivable [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | 3,548 | 3,595 | 2,810
Additions to allowance for doubtful accounts | 767 | 1,616 | 2,961
Deductions to allowance for doubtful accounts | (1,467) | (1,663) | (2,176)
Allowance for doubtful accounts, ending balance | 2,848 | 3,548 | 3,595
Allowance for Doubtful Accounts - Notes Receivable [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | 61 | 868 | 698
Additions to allowance for doubtful accounts | 186 | 196 | 413
Deductions to allowance for doubtful accounts | (65) | (1,003) | (243)
Allowance for doubtful accounts, ending balance | $ 182 | $ 61 | $ 868

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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