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Debt - Summary of Consolidated Indebtedness (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,519,378,000 | $ 1,505,671,000
Mortgage and other notes payable, net | 1,143,049,000 | 1,055,728,000
Unsecured notes payable, net | 358,847,000 | 432,990,000
Net unamortized debt issuance costs | (18,640,000) | (18,289,000)
Unamortized fair market value of assumed debt | 1,158,000 | 1,336,000
Total indebtedness | 1,501,896,000 | 1,488,718,000
Total Debt - Fixed and Effectively Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 926,314,000 | 860,486,000
Total Debt - Variable Rate [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 593,064,000 | 645,185,000
Total Debt - Variable Rate Fixed and Effectively Fixed Rate During Period [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 431,774 | 365,343
Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Mortgage and other notes payable, net | 1,143,049,000 | 1,055,728,000
Net unamortized debt issuance costs | (16,951,000) | (16,642,000)
Unamortized fair market value of assumed debt | 1,158,000 | 1,336,000
Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable, net | 358,847,000 | 432,990,000
Net unamortized debt issuance costs | (1,689,000) | (1,646,000)
Total indebtedness | 0 | 9,900,000
Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured line of credit | 0 | 0
Core Portfolio [Member] | Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 315,936,000 | 317,125,000
Core Portfolio [Member] | Mortgages [Member] | Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 234,273,000 | 234,875,000
Core Portfolio [Member] | Mortgages [Member] | Variable Rate - Swapped [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 81,663,000 | 82,250,000
Core Portfolio [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 300,000,000 | 300,000,000
Core Portfolio [Member] | Unsecured Debt [Member] | Unsecured Term Loans [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 51,283,000 | 51,194,000
Core Portfolio [Member] | Unsecured Debt [Member] | Variable Rate Unsecured Term Loans - Swapped [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 248,717,000 | 248,806,000
Core Portfolio [Member] | Line of Credit [Member] | Unsecured Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 0 | 0
Fund II [Member] | Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 412,238,000 | 412,291,000
Fund II [Member] | Mortgages [Member] | Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 249,762,000 | $ 249,762,000
Fund II [Member] | Mortgages [Member] | Variable Rate - Swapped [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.88% | 2.88%
Long-term debt, gross | $ 19,726,000 | $ 19,779,000
Fund II [Member] | Mortgages [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 142,750,000 | 142,750,000
Fund III [Member] | Mortgages [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 79,680,000 | 83,467,000
Fund IV [Member] | Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 350,988,000 | 258,151,000
Fund IV [Member] | Mortgages [Member] | Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 10,504,000 | $ 10,503,000
Fund IV [Member] | Mortgages [Member] | Variable Rate - Swapped [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 1.78% | 1.78%
Long-term debt, gross | $ 81,668,000 | $ 14,509,000
Fund IV [Member] | Mortgages [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 258,816,000 | 233,139,000
Fund IV [Member] | Unsecured Debt [Member] | Term Loan / Subscription Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 60,536,000 | $ 134,636,000
London Interbank Offered Rate (LIBOR) [Member] | Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.15% |
London Interbank Offered Rate (LIBOR) [Member] | Core Portfolio [Member] | Line of Credit [Member] | Unsecured Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.40% | 1.40%
Minimum [Member] | Core Portfolio [Member] | Mortgages [Member] | Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.88% | 3.88%
Minimum [Member] | Core Portfolio [Member] | Mortgages [Member] | Variable Rate - Swapped [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 1.71% | 1.71%
Minimum [Member] | Core Portfolio [Member] | Unsecured Debt [Member] | Variable Rate Unsecured Term Loans - Swapped [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 1.24% | 1.24%
Minimum [Member] | Fund II [Member] | Mortgages [Member] | Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 1.00% | 1.00%
Minimum [Member] | Fund IV [Member] | Mortgages [Member] | Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.40% | 3.40%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Core Portfolio [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.08% |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Core Portfolio [Member] | Variable Rate Unsecured Term Loans - Swapped [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.30% |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Core Portfolio [Member] | Unsecured Debt [Member] | Unsecured Term Loans [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.30% | 1.30%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund II [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.79% |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund II [Member] | Mortgages [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.79% | 0.62%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund IV [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.70% |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund IV [Member] | Mortgages [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.70% | 1.70%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund IV [Member] | Unsecured Debt [Member] | Term Loan / Subscription Facility [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.65% | 1.65%
Minimum [Member] | Prime Rate [Member] | Fund III [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.50% |
Minimum [Member] | Prime Rate [Member] | Fund III [Member] | Mortgages [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.50% | 0.50%
Maximum [Member] | Core Portfolio [Member] | Mortgages [Member] | Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 6.65% | 6.65%
Maximum [Member] | Core Portfolio [Member] | Mortgages [Member] | Variable Rate - Swapped [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.77% | 3.77%
Maximum [Member] | Core Portfolio [Member] | Unsecured Debt [Member] | Variable Rate Unsecured Term Loans - Swapped [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.77% | 3.77%
Maximum [Member] | Fund II [Member] | Mortgages [Member] | Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 5.80% | 5.80%
Maximum [Member] | Fund IV [Member] | Mortgages [Member] | Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.50% | 4.50%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Core Portfolio [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.90% |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Core Portfolio [Member] | Variable Rate Unsecured Term Loans - Swapped [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Core Portfolio [Member] | Unsecured Debt [Member] | Unsecured Term Loans [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% | 1.60%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund II [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.50% |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund II [Member] | Mortgages [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.50% | 2.50%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund III [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.65% |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund III [Member] | Mortgages [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.65% | 4.65%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund IV [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.95% |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund IV [Member] | Mortgages [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.95% | 3.95%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fund IV [Member] | Unsecured Debt [Member] | Term Loan / Subscription Facility [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.75% | 2.75%

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)) -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 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 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 + Details
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