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Equity - Outperformance Program (Details) - USD ($) |  |  |  |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 02, 2015 | Jan. 02, 2014 | Jan. 02, 2013 | Jan. 02, 2012 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Performance period |  |  |  |  | 3 years |  |  |  |
Amortization of stock-based compensation |  |  |  |  | $ 4,363,000 |  | $ 7,979,000 |  |
General and Administrative Expense |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 4,200,000 | $ 3,300,000 |  |  |
Deferred Leasing Costs and Lease Intatngibles, Net |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 200,000 | 200,000 |  |  |
Additional Paid in Capital |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Amortization of stock-based compensation |  |  |  |  | $ 4,363,000 | $ 3,500,000 | 7,979,000 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 2 years |  |  |  |
2012 Outperformance Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Maximum share value authorized under plan |  |  |  |  | $ 10,000,000 |  |  |  |
Performance period |  |  |  |  | 3 years |  |  |  |
Percentage amount TSR exceeds simple annual TSR |  |  |  |  | 4.00% |  |  |  |
Simple annual TSR |  |  |  |  | 9.00% |  |  |  |
Percent TSR exceeds SNL Equity REIT index |  |  |  |  | 4.00% |  |  |  |
Percent of underperformance of SNL Equity REIT index |  |  |  |  | 4.00% |  |  |  |
Underperformance of SNL Equity REIT index per year |  |  |  |  | 3.00% |  |  |  |
Award vesting period |  |  |  |  | 2 years |  |  |  |
Participation interest outstanding |  |  |  |  | 75.00% |  |  |  |
Stock settled awards |  |  |  | $ 2,620,000 |  |  |  |  |
Forfeiture adjustment as percent of total cost |  |  |  | 6.00% |  |  |  |  |
OPP, fair value |  |  |  |  |  |  |  |  | $ 3,490,000
Risk free interest rate |  |  |  | 0.40% |  |  |  |  |
Expected dividend payment per share |  |  |  | $ 1.62 |  |  |  |  |
2012 Outperformance Program | The Company |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Expected volatility rate |  |  |  | 36.00% |  |  |  |  |
2012 Outperformance Program | SNL Equity REIT Index |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Expected volatility rate |  |  |  | 35.00% |  |  |  |  |
2012 Outperformance Program | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Absolute TSR reduced on a linear basis |  |  |  |  | 100.00% |  |  |  |
Simple TSR reduced on a linear basis |  |  |  |  | 7.00% |  |  |  |
2012 Outperformance Program | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Absolute TSR reduced on a linear basis |  |  |  |  | 0.00% |  |  |  |
Simple TSR reduced on a linear basis |  |  |  |  | 0.00% |  |  |  |
2012 Outperformance Program | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Shares granted under OPP |  |  |  |  | 125,475 |  |  |  |
2012 Outperformance Program | Common Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Shares granted under OPP |  |  |  |  | 125,477 |  |  |  |
2013 Outperformance Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Maximum share value authorized under plan |  |  |  |  | $ 11,000,000 |  |  |  |
Performance period |  |  |  |  | 3 years |  |  |  |
Percentage amount TSR exceeds simple annual TSR |  |  |  |  | 4.00% |  |  |  |
Simple annual TSR |  |  |  |  | 9.00% |  |  |  |
Percent TSR exceeds SNL Equity REIT index |  |  |  |  | 4.00% |  |  |  |
Percent of underperformance of SNL Equity REIT index |  |  |  |  | 4.00% |  |  |  |
Underperformance of SNL Equity REIT index per year |  |  |  |  | 3.00% |  |  |  |
Award vesting period |  |  |  |  | 2 years |  |  |  |
Stock settled awards |  |  | $ 3,520,000 |  |  |  |  |  |
Forfeiture adjustment as percent of total cost |  |  | 6.00% |  |  |  |  |  |
OPP, fair value |  |  |  |  |  |  |  | $ 4,140,000 |
Risk free interest rate |  |  | 0.38% |  |  |  |  |  |
Expected dividend payment per share |  |  | $ 1.50 |  |  |  |  |  |
2013 Outperformance Program | The Company |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Expected volatility rate |  |  | 33.00% |  |  |  |  |  |
2013 Outperformance Program | SNL Equity REIT Index |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Expected volatility rate |  |  | 25.00% |  |  |  |  |  |
2013 Outperformance Program | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Absolute TSR reduced on a linear basis |  |  |  |  | 100.00% |  |  |  |
Simple TSR reduced on a linear basis |  |  |  |  | 7.00% |  |  |  |
Hypothetical bonus pool for stock settled award |  |  |  |  | $ 4,000,000 |  |  |  |
2013 Outperformance Program | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Absolute TSR reduced on a linear basis |  |  |  |  | 0.00% |  |  |  |
Simple TSR reduced on a linear basis |  |  |  |  | 0.00% |  |  |  |
Hypothetical bonus pool for stock settled award |  |  |  |  | $ 2,000,000 |  |  |  |
2014 Outperformance Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Maximum share value authorized under plan |  |  |  |  | 12,000,000 |  |  |  |
Target bonus pool |  |  |  |  | $ 2,400,000 |  |  |  |
Simple annual TSR |  |  |  |  | 10.50% |  |  |  |
Percentage amount TSR exceeds simple annual TSR |  |  |  |  | 4.00% |  |  |  |
Simple annual TSR |  |  |  |  | 9.00% |  |  |  |
Percent TSR exceeds SNL Equity REIT index |  |  |  |  | 4.00% |  |  |  |
Percent of underperformance of SNL Equity REIT index |  |  |  |  | 4.00% |  |  |  |
Underperformance of SNL Equity REIT index per year |  |  |  |  | 3.00% |  |  |  |
Stock settled awards |  | $ 3,210,000 |  |  |  |  |  |  |
Forfeiture adjustment as percent of total cost |  | 10.00% |  |  |  |  |  |  |
OPP, fair value |  |  |  |  |  |  | $ 3,210,000 |  |
Risk free interest rate |  | 0.77% |  |  |  |  |  |  |
Expected dividend payment per share |  | $ 1.50 |  |  |  |  |  |  |
2014 Outperformance Program | The Company |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Expected volatility rate |  | 28.00% |  |  |  |  |  |  |
2014 Outperformance Program | SNL Equity REIT Index |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Expected volatility rate |  | 26.00% |  |  |  |  |  |  |
2014 Outperformance Program | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Absolute TSR reduced on a linear basis |  |  |  |  | 100.00% |  |  |  |
Simple TSR reduced on a linear basis |  |  |  |  | 7.00% |  |  |  |
2014 Outperformance Program | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Absolute TSR reduced on a linear basis |  |  |  |  | 0.00% |  |  |  |
Simple TSR reduced on a linear basis |  |  |  |  | 0.00% |  |  |  |
2015 Outperformance Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Maximum share value authorized under plan |  |  |  |  | $ 15,000,000 |  |  |  |
Performance period |  |  |  |  | 3 years |  |  |  |
Target bonus pool |  |  |  |  | $ 3,800,000 |  |  |  |
Simple annual TSR |  |  |  |  | 10.50% |  |  |  |
Percentage amount TSR exceeds simple annual TSR |  |  |  |  | 4.00% |  |  |  |
Simple annual TSR |  |  |  |  | 9.00% |  |  |  |
Percent TSR exceeds SNL Equity REIT index |  |  |  |  | 4.00% |  |  |  |
Percent of underperformance of SNL Equity REIT index |  |  |  |  | 4.00% |  |  |  |
Underperformance of SNL Equity REIT index per year |  |  |  |  | 3.00% |  |  |  |
Award vesting period |  |  |  |  | 2 years |  |  |  |
Stock settled awards |  | $ 3,980,000 |  |  |  |  |  |  |
Forfeiture adjustment as percent of total cost | 6.00% |  |  |  |  |  |  |  |
OPP, fair value |  |  |  |  | $ 4,270,000 |  |  |  |
Risk free interest rate | 1.13% |  |  |  |  |  |  |  |
Expected dividend payment per share | $ 1.50 |  |  |  |  |  |  |  |
2015 Outperformance Program | The Company |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Expected volatility rate | 22.00% |  |  |  |  |  |  |  |
2015 Outperformance Program | SNL Equity REIT Index |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Expected volatility rate | 22.00% |  |  |  |  |  |  |  |
2015 Outperformance Program | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Absolute TSR reduced on a linear basis |  |  |  |  | 100.00% |  |  |  |
Simple TSR reduced on a linear basis |  |  |  |  | 7.00% |  |  |  |
2015 Outperformance Program | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Absolute TSR reduced on a linear basis |  |  |  |  | 0.00% |  |  |  |
Simple TSR reduced on a linear basis |  |  |  |  | 0.00% |  |  |  |

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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907 + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Net number of non-option equity instruments granted to participants. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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