Income taxes Income Tax Treatment of Distributions (Details) (USD $)
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12 Months Ended |
Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Common Stock |
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Income Tax Treatment of Distributions and Dividends [Line Items] |
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Ordinary income |
91.80%are_IncomeTaxTreatmentOfDistributionsOrdinaryIncomePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
85.90%are_IncomeTaxTreatmentOfDistributionsOrdinaryIncomePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
85.00%are_IncomeTaxTreatmentOfDistributionsOrdinaryIncomePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Return of capital |
8.20%are_IncomeTaxTreatmentOfDistributionsReturnOfCapitalPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
11.60%are_IncomeTaxTreatmentOfDistributionsReturnOfCapitalPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
4.60%are_IncomeTaxTreatmentOfDistributionsReturnOfCapitalPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Capital gains |
0.00%are_IncomeTaxTreatmentOfDistributionsCapitalGainsAt15PercentPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
2.50%are_IncomeTaxTreatmentOfDistributionsCapitalGainsAt15PercentPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
10.40%are_IncomeTaxTreatmentOfDistributionsCapitalGainsAt15PercentPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Total |
100.00%are_IncomeTaxTreatmentOfDistributionsPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
100.00%are_IncomeTaxTreatmentOfDistributionsPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
100.00%are_IncomeTaxTreatmentOfDistributionsPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Dividends declared |
$ 2.88us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
$ 2.61us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
$ 2.09us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Series C Preferred Stock |
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Income Tax Treatment of Distributions and Dividends [Line Items] |
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Ordinary income |
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89.10%are_IncomeTaxTreatmentOfDistributionsOrdinaryIncomePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Return of capital |
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0.00%are_IncomeTaxTreatmentOfDistributionsReturnOfCapitalPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Capital gains |
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10.90%are_IncomeTaxTreatmentOfDistributionsCapitalGainsAt15PercentPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Total |
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100.00%are_IncomeTaxTreatmentOfDistributionsPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Dividends declared |
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$ 0.5234375us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
Series D Convertible Preferred Stock |
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Income Tax Treatment of Distributions and Dividends [Line Items] |
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Ordinary income |
100.00%are_IncomeTaxTreatmentOfDistributionsOrdinaryIncomePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
97.20%are_IncomeTaxTreatmentOfDistributionsOrdinaryIncomePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
89.10%are_IncomeTaxTreatmentOfDistributionsOrdinaryIncomePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
Return of capital |
0.00%are_IncomeTaxTreatmentOfDistributionsReturnOfCapitalPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
0.00%are_IncomeTaxTreatmentOfDistributionsReturnOfCapitalPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
0.00%are_IncomeTaxTreatmentOfDistributionsReturnOfCapitalPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
Capital gains |
0.00%are_IncomeTaxTreatmentOfDistributionsCapitalGainsAt15PercentPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
2.80%are_IncomeTaxTreatmentOfDistributionsCapitalGainsAt15PercentPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
10.90%are_IncomeTaxTreatmentOfDistributionsCapitalGainsAt15PercentPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
Total |
100.00%are_IncomeTaxTreatmentOfDistributionsPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
100.00%are_IncomeTaxTreatmentOfDistributionsPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
100.00%are_IncomeTaxTreatmentOfDistributionsPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
Dividends declared |
$ 1.75us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
$ 1.75us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
$ 1.75us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
Series E Cumulative Redeemable Preferred Stock |
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Income Tax Treatment of Distributions and Dividends [Line Items] |
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Ordinary income |
100.00%are_IncomeTaxTreatmentOfDistributionsOrdinaryIncomePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
97.20%are_IncomeTaxTreatmentOfDistributionsOrdinaryIncomePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
89.10%are_IncomeTaxTreatmentOfDistributionsOrdinaryIncomePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
Return of capital |
0.00%are_IncomeTaxTreatmentOfDistributionsReturnOfCapitalPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
0.00%are_IncomeTaxTreatmentOfDistributionsReturnOfCapitalPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
0.00%are_IncomeTaxTreatmentOfDistributionsReturnOfCapitalPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
Capital gains |
0.00%are_IncomeTaxTreatmentOfDistributionsCapitalGainsAt15PercentPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
2.80%are_IncomeTaxTreatmentOfDistributionsCapitalGainsAt15PercentPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
10.90%are_IncomeTaxTreatmentOfDistributionsCapitalGainsAt15PercentPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
Total |
100.00%are_IncomeTaxTreatmentOfDistributionsPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
100.00%are_IncomeTaxTreatmentOfDistributionsPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
100.00%are_IncomeTaxTreatmentOfDistributionsPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
Dividends declared |
$ 1.6125us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
$ 1.6125us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
$ 1.34375us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |