Debt Financing Debt Financing Schedule of Long Term Debt (Details) $ in Thousands, AUD in Millions | 1 Months Ended | | |
May 30, 2017USD ($)$ / AUD | May 30, 2017AUD$ / AUD | Jun. 30, 2017USD ($) | Dec. 31, 2016USD ($) |
Debt Instrument [Line Items] | | | | |
Debt, Principal Outstanding | | | $ 1,979,650 | $ 2,215,717 |
Unamortized Deferred Financing Fees | | | (7,004) | (8,418) |
Notes Payable | | | $ 1,972,646 | 2,207,299 |
Revolving Credit Facility- Revolving Loan [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Credit facility, Interest Rate (percent) | | | 2.73% | |
Credit facility, principal outstanding | | | $ 28,000 | 119,000 |
Revolving Credit Facility- Term Loan [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Credit facility, Interest Rate (percent) | | | 2.68% | |
Credit facility, principal outstanding | | | $ 495,000 | 495,000 |
Brindleyplace JV [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Debt, Principal Outstanding | | | | 149,343 |
Fifty South Sixth [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.65% | |
Debt, Principal Outstanding | | | $ 125,000 | 125,000 |
Flagship Capital Joint Venture [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Credit facility, Interest Rate (percent) | | | 4.25% | |
Credit facility, principal outstanding | | | $ 1,210 | 512 |
One Hundred Brookes Street [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 3.77% | |
Debt, Principal Outstanding | | | $ 27,670 | 31,109 |
Reduction In basis spread on variable rate debt | 0.20% | 0.20% | | |
Repayments of debt | $ 5,400 | AUD 7.2 | | |
Foreign currency exchange rate, translation (in usd per share) | $ / AUD | 0.74 | 0.74 | | |
Poland Logistics Portfolio [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.00% | |
Debt, Principal Outstanding | | | $ 68,518 | 64,294 |
Minneapolis Retail Center [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 3.50% | |
Debt, Principal Outstanding | | | $ 65,500 | 65,500 |
Eight Twenty Five Ann [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.32% | |
Debt, Principal Outstanding | | | $ 62,283 | 58,320 |
Mercedes Benz Bank [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 1.23% | |
Debt, Principal Outstanding | | | $ 37,865 | 35,041 |
465 Victoria [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.97% | |
Debt, Principal Outstanding | | | $ 40,895 | 38,293 |
New City [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.30% | |
Debt, Principal Outstanding | | | $ 78,127 | 73,612 |
One Westferry Circus [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 3.30% | |
Debt, Principal Outstanding | | | $ 62,410 | 59,213 |
The Campus at Playa Vista [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.46% | |
Debt, Principal Outstanding | | | $ 150,000 | 150,000 |
Perspective Defense [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.17% | |
Debt, Principal Outstanding | | | $ 79,961 | 73,612 |
Fiege Mega Centre [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 1.37% | |
Debt, Principal Outstanding | | | $ 25,819 | 23,924 |
55 M Street [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.67% | |
Debt, Principal Outstanding | | | $ 72,000 | 72,000 |
25 Cabot Square [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 3.50% | |
Debt, Principal Outstanding | | | $ 160,900 | 152,658 |
Simon Hegele Logistics [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 1.90% | |
Debt, Principal Outstanding | | | $ 40,165 | 37,167 |
818 Bourke [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.37% | |
Debt, Principal Outstanding | | | $ 65,523 | 62,254 |
The Summit [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.61% | |
Debt, Principal Outstanding | | | $ 170,000 | 170,000 |
Harder Logistics Portfolio [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 0.95% | |
Debt, Principal Outstanding | | | $ 77,907 | 72,275 |
Water Wall Place [Member] | Construction Loan Payable [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Effective interest rate (percent) | | | 2.83% | |
Debt, Principal Outstanding | | | $ 44,897 | 44,897 |
Ponce And Bird [Member] | Construction Loan Payable [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Debt, Principal Outstanding | | | | $ 42,693 |
Minimum [Member] | Flagship Capital Joint Venture [Member] | Secured Debt [Member] | | | | |
Debt Instrument [Line Items] | | | | |
Variable interest rate, floor (percent) | | | 4.25% | |