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Notes Payable and Unsecured Credit Facilities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 11,422 |  |
Maturities of Long-term Debt [Abstract] |  |  |
2017 | 84,335 |  |
2018 | 151,457 |  |
2019 | 230,653 |  |
2020 | 544,518 |  |
2021 | 298,194 |  |
Beyond 5 Years | 2,111,306 |  |
Unamortized debt premium/(discount) and issuance costs | (13,237) |  |
Long-term Debt | 3,407,226 |  | $ 1,642,420
Fixed Rate Mortgage Loans [Member] |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Long-term Debt | 607,173 |  | 384,786
Notes Payable to Banks [Member] |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Long-term Debt | 2,749,202 |  | 1,363,925
Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total credit facilities | 658,024 |  | 278,495
Maturities of Long-term Debt [Abstract] |  |  |
Long-term Debt | 2,025,705 |  | 892,170
Line of Credit [Member] | Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total credit facilities | 95,000 |  | 15,000
Term Loan [Member] | Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total credit facilities | 563,024 |  | 263,495
Parent Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 11,422 | $ 27,281 |
Fellsway $28.1M, Swap fixed 3.696% [Member] | Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.70% |  |
Blackrock $20M, Swap fixed 2.803% [Member] | Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 2.80% |  |
Scheduled Principal Payments [Member] | Mortgages [Member] |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2017 | $ 8,824 |  |
2018 | 11,481 |  |
2019 | 11,251 |  |
2020 | 10,107 |  |
2021 | 9,193 |  |
Beyond 5 Years | 41,308 |  |
Unamortized debt premium/(discount) and issuance costs | 0 |  |
Long-term Debt | 92,164 |  |
Mortgage Loan Maturities [Member] | Mortgages [Member] |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2017 | 75,511 |  |
2018 | 139,976 |  |
2019 | 124,402 |  |
2020 | 84,411 |  |
2021 | 39,001 |  |
Beyond 5 Years | 154,998 |  |
Unamortized debt premium/(discount) and issuance costs | 13,035 |  |
Long-term Debt | 631,334 |  |
Unsecured Maturities [Member] | Unsecured Debt [Member] |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2017 | 0 |  |
2018 | 0 |  |
2019 | 95,000 |  |
2020 | 450,000 |  |
2021 | 250,000 |  |
Beyond 5 Years | 1,915,000 |  |
Unamortized debt premium/(discount) and issuance costs | (26,272) |  |
Long-term Debt | 2,683,728 |  |
London Interbank Offered Rate (LIBOR) [Member] | Variable Rate Mortgage Loans [Member] |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Long-term Debt | 116,324 |  | $ 86,969
Derivative @ 2.196% 28.1M [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, Notional Amount | 28,100 |  |
Derivative @ 1.30250% 20.0M [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, Notional Amount | $ 20,000 |  |
Contractual Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 1.80% |  |
Contractual Rate [Member] | Fixed Rate Mortgage Loans [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 5.60% |  |
Contractual Rate [Member] | Variable Rate Mortgage Loans [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 2.13% |  |
Contractual Rate [Member] | Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 4.10% |  |
Contractual Rate [Member] | Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 2.40% |  |
Effective Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 1.90% |  |
Effective Rate [Member] | Fixed Rate Mortgage Loans [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 5.70% |  |
Effective Rate [Member] | Variable Rate Mortgage Loans [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 2.29% |  |
Effective Rate [Member] | Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 4.60% |  |
Effective Rate [Member] | Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 2.40% |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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