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Notes Payable and Unsecured Credit Facilities (Details) - USD ($) $ in Thousands |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 05, 2022 | Jul. 07, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jul. 13, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |
Document Period End Date |  |  | Jun. 30, 2016 |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year |  |  | $ 2,963 |  |  |
2017 |  |  | 423,076 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | 62,461 |  |  |
2019 |  |  | 420,393 |  |  |
2020 |  |  | 238,360 |  |  |
Beyond 5 Years |  |  | 839,976 |  |  |
Unamortized debt (discounts) premiums, net |  |  | (3,013) |  |  |
Long-term Debt |  |  | 1,984,216 |  |  | $ 1,864,285
Mortgages [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Long-term Debt |  |  | 429,273 |  |  | 475,214
Notes Payable to Banks [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Long-term Debt |  |  | 1,674,631 |  |  | 1,699,771
Unsecured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total credit facilities |  |  | 309,585 |  |  | 164,514
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Long-term Debt |  |  | 1,191,204 |  |  | 1,190,403
Line of Credit [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total credit facilities |  |  | 145,000 |  |  | 0
Term Loan [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total credit facilities |  |  | 164,585 |  |  | 164,514
Parent Company [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Notes Payable |  |  | $ 41,584 | $ 76,027 |  |
Construction Loans [Member] | Variable Income Interest Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  | one month LIBOR plus 150 basis points |  |  |
Fellsway $28.1M, Swap fixed 3.696% [Member] | Mortgages [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 3.696% |  |  |
Blackrock $20M, Swap fixed 2.803% [Member] | Mortgages [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 2.803% |  |  |
Scheduled Principal Payments [Member] | Mortgages [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year |  |  | $ 2,963 |  |  |
2017 |  |  | 5,778 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | 5,103 |  |  |
2019 |  |  | 4,393 |  |  |
2020 |  |  | 4,349 |  |  |
Beyond 5 Years |  |  | 13,184 |  |  |
Unamortized debt (discounts) premiums, net |  |  | 0 |  |  |
Long-term Debt |  |  | 35,770 |  |  |
Mortgage Loan Maturities [Member] | Mortgages [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year |  |  | 0 |  |  |
2017 |  |  | 117,298 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | 57,358 |  |  |
2019 |  |  | 106,000 |  |  |
2020 |  |  | 84,011 |  |  |
Beyond 5 Years |  |  | 76,792 |  |  |
Unamortized debt (discounts) premiums, net |  |  | 6,198 |  |  |
Long-term Debt |  |  | 447,657 |  |  |
Unsecured Maturities [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year |  |  | 0 |  |  |
2017 |  |  | 300,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | 0 |  |  |
2019 |  |  | 310,000 |  |  |
2020 |  |  | 150,000 |  |  |
Beyond 5 Years |  |  | 750,000 |  |  |
Unamortized debt (discounts) premiums, net |  |  | (9,211) |  |  |
Long-term Debt |  |  | 1,500,789 |  |  |
Subsequent Event [Member] | Unsecured Debt [Member] |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.875% |
Notice of Repayment of Unsecured Debt Subsequent to Period End Date, Make-Whole Premium Costs |  |  |  |  | $ 13,200 |
Subsequent Event [Member] | Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Increase in Borrowing Capacity |  | $ 100,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 265,000 |  |  |  |
Line of Credit Facility, Expiration Date | Jan. 05, 2022 |  |  |  |  |
Line of Credit Facility, Interest Rate Description |  | LIBOR plus a ratings based margin of 0.95% |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 2.00% |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Mortgages [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  | 20,000 |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Long-term Debt |  |  | 54,154 |  |  | $ 34,154
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 |  |  |

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