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Notes Payable and Unsecured Credit Facilities (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 26, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 01, 2017 | Feb. 24, 2017 | Jul. 07, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |
Current Fiscal Year End Date |  | --12-31 |  |  |  |  |
Document Fiscal Year Focus |  | 2016 |  |  |  |  |
Long-term Debt |  | $ 1,642,420 | $ 1,864,285 |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
2017 |  | 91,618 |  |  |  |  |
2018 |  | 62,187 |  |  |  |  |
2019 |  | 125,205 |  |  |  |  |
2020 |  | 239,047 |  |  |  |  |
2021 |  | 288,970 |  |  |  |  |
Beyond 5 Years |  | 840,067 |  |  |  |  |
Unamortized debt discounts (premiums) |  | (4,674) |  |  |  |  |
Partnership Interest [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes Payable |  | 1,363,925 | 1,699,771 |  |  |  |
Mortgage loans assumed for the acquisition of real estate |  | 0 | 42,799 | $ 103,187 |  |  |
Proceeds from unsecured credit facilities |  | 460,000 | 445,000 | $ 255,000 |  |  |
Derivative @ 2.196% 28.1K [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | 28,100 |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 800,000 |  |  |  |  |
Debt Instrument, Maturity Date |  | May 13, 2019 |  |  |  |  |
Line of Credit Facility, Interest Rate Description |  | LIBOR plus 0.925% |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 779,200 |  |  |  |  |
Line of Credit Facility, Annual Fee Description |  | .0015 |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  | LIBOR plus 0.95% |  |  |  |  |
Debt Instrument, Maturity Date |  | Jan. 05, 2022 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Unsecured credit facilities - maximum borrowing capacity |  | $ 265,000 |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  | $ 0 |  |  |  |  |
Line of Credit Facility, Annual Fee Description |  | 35 |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  |  |  | 2.00%
Contractual Rate [Member] | Line of Credit [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 1.40% |  |  |  |  |
Contractual Rate [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 2.00% |  |  |  |  |
Effective Rate [Member] | Line of Credit [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 1.70% |  |  |  |  |
Effective Rate [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 2.10% |  |  |  |  |
Mortgages [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt |  | $ 384,786 | 475,214 |  |  |  |
Mortgages [Member] | Scheduled Principal Payments [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt |  | 32,617 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
2017 |  | 5,279 |  |  |  |  |
2018 |  | 4,829 |  |  |  |  |
2019 |  | 4,205 |  |  |  |  |
2020 |  | 4,636 |  |  |  |  |
2021 |  | 3,780 |  |  |  |  |
Beyond 5 Years |  | 9,888 |  |  |  |  |
Unamortized debt discounts (premiums) |  | 0 |  |  |  |  |
Mortgages [Member] | Mortgage Loan Maturities [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt |  | 439,139 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
2017 |  | 86,339 |  |  |  |  |
2018 |  | 57,358 |  |  |  |  |
2019 |  | 106,000 |  |  |  |  |
2020 |  | 84,411 |  |  |  |  |
2021 |  | 35,190 |  |  |  |  |
Beyond 5 Years |  | 65,179 |  |  |  |  |
Unamortized debt discounts (premiums) |  | $ 4,662 |  |  |  |  |
Mortgages [Member] | Fellsway $28.1M, Swap fixed 3.696% [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.696% |  |  |  |  |
Mortgages [Member] | Blackrock $20M, Swap fixed 2.803% [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 2.803% |  |  |  |  |
Mortgages [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt |  | $ 86,969 | 34,154 |  |  |  |
Mortgages [Member] | Contractual Rate [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 5.80% |  |  |  |  |
Mortgages [Member] | Effective Rate [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 6.00% |  |  |  |  |
Notes Payable to Banks [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt |  | $ 1,363,925 | 1,699,771 |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Maturity Date Range, End |  | Jan. 01, 2032 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  | 3.30% |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum |  | 8.40% |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Maturity Date Range, End |  | Jan. 01, 2025 |  |  |  |  |
Long-term Debt |  | $ 892,170 | 1,190,403 |  |  |  |
Long-term Line of Credit |  | $ 278,495 | 164,514 |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  | 3.75% |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum |  | 6.00% |  |  |  |  |
Unsecured Debt [Member] | Unsecured Maturities [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt |  | $ 1,170,664 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
2017 |  | 0 |  |  |  |  |
2018 |  | 0 |  |  |  |  |
2019 |  | 15,000 |  |  |  |  |
2020 |  | 150,000 |  |  |  |  |
2021 |  | 250,000 |  |  |  |  |
Beyond 5 Years |  | 765,000 |  |  |  |  |
Unamortized debt discounts (premiums) |  | (9,336) |  |  |  |  |
Unsecured Debt [Member] | Line of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Line of Credit |  | 15,000 | 0 |  |  |  |
Unsecured Debt [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Line of Credit |  | $ 263,495 | $ 164,514 |  |  |  |
Unsecured Debt [Member] | Contractual Rate [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 4.50% |  |  |  |  |
Unsecured Debt [Member] | Effective Rate [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 5.30% |  |  |  |  |
Subsequent Event [Member] | $350M 3.6% Unsecured Debt Offering [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 350,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.60% |  |  |  |  |  |
Debt Instrument, Maturity Date | Feb. 01, 2027 |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 99.741% |  |  |  |  |  |
Subsequent Event [Member] | $300M 4.4% Unsecured Debt Offering [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 300,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.40% |  |  |  |  |  |
Debt Instrument, Maturity Date | Feb. 01, 2047 |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 99.11% |  |  |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  | $ 300,000 |
Subsequent Event [Member] | Mortgages [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt |  |  |  |  | $ 285,000 |  |
Subsequent Event [Member] | Line of Credit [Member] | Line of Credit Facility - Unsecured [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Increase Allowed to Borrowing Capacity | $ 1,000,000 |  |  |  |  | $ 1,000,000 |

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