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Mortgages and Notes Payable (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) extensions | Jun. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Oct. 20, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgages and notes payable | $ 2,478,753,000 |  |  | $ 2,478,753,000 |  |  | $ 2,071,389,000
Loss on debt extinguishment | 0 |  | $ (326,000) | (220,000) | $ (308,000) |  |
Amount of funded capital expenditures reserve | 19,310,000 |  |  | 19,310,000 |  |  | 14,595,000
Revolving Credit Facility due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity on revolving credit facility | 475,000,000 |  |  | $ 475,000,000 |  |  |
Maturity date on revolving credit facility |  |  |  | Jan. 01, 2018 |  |  |
Additional borrowing capacity on revolving credit facility | $ 75,000,000 |  |  | $ 75,000,000 |  |  |
Number of additional maturity extensions | extensions | 2 |  |  |  |  |  |
Term of optional extension | 6 months |  |  |  |  |  |
Facility interest rate basis | LIBOR plus 110 basis points |  |  |  |  |  |
Interest rate spread (in hundredths) | 1.10% |  |  |  |  |  |
Annual facility fee (in hundredths) | 0.20% |  |  |  |  |  |
Amount outstanding on revolving credit facility | $ 265,000,000 |  |  | 265,000,000 |  |  |
Outstanding letters of credit on revolving credit facility | 200,000 |  |  | 200,000 |  |  |
Unused borrowing capacity on revolving credit facility | 209,800,000 |  |  | 209,800,000 |  |  |
Bridge Term Loan Facility due 2016 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity on revolving credit facility | $ 350,000,000 |  |  | $ 350,000,000 |  |  |
Maturity date on revolving credit facility |  |  |  | Mar. 28, 2016 |  |  |
Term of optional extension | 6 months |  |  |  |  |  |
Facility interest rate basis | LIBOR plus 110 basis points |  |  |  |  |  |
Interest rate spread (in hundredths) | 1.10% |  |  |  |  |  |
Amount outstanding on revolving credit facility | $ 250,000,000 |  |  | $ 250,000,000 |  |  |
Unused borrowing capacity on revolving credit facility | $ 100,000,000 |  |  | 100,000,000 |  |  |
Term of debt instrument | 6 months |  |  |  |  |  |
Variable Rate Term Loan (2) due 2019 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate spread (in hundredths) |  | 1.75% |  |  |  |  |
Principal debt amount |  | $ 225,000,000 |  |  |  |  |
Term of debt instrument |  | 7 years |  |  |  |  |
Scheduled maturity date |  | Jan. 01, 2019 |  |  |  |  |
Debt, variable interest rate basis |  | LIBOR plus 175 basis points |  |  |  |  |
Variable Rate Term Loan due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate spread (in hundredths) |  | 1.10% |  |  |  |  |
Principal debt amount |  | $ 350,000,000 |  |  |  |  |
Scheduled maturity date |  | Jun. 01, 2020 |  |  |  |  |
Debt, variable interest rate basis |  | LIBOR plus 110 basis points |  |  |  |  |
Deferred financing fees |  | $ 1,300,000 |  |  |  |  |
5.17% (6.43% effective rate) Mortage Loan due 2015 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Early repayment of debt |  | $ 39,400,000 |  |  |  |  |
Scheduled maturity date |  | Nov. 01, 2015 |  |  |  |  |
Effective interest rate (in hundredths) |  | 6.43% |  |  |  |  |
Loss on debt extinguishment |  | $ 200,000 |  |  |  |  |
6.11% (5.36% effective rate) Mortgage Loan due 2017 (Note A) [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal debt amount |  | $ 18,000,000 |  |  |  |  |
Scheduled maturity date |  | Jul. 06, 2017 |  |  |  |  |
Effective interest rate (in hundredths) |  | 5.36% |  |  |  |  |
Percentage of equity interest acquired in unconsolidated affiliate (in hundredths) |  | 77.20% |  |  |  |  |
Amount of funded capital expenditures reserve |  | $ 3,000,000 |  |  |  |  |
Mortgage prepayment date |  | Oct. 06, 2016 |  |  |  |  |
Fair value of debt assumed in connection with the acquisition |  | $ 18,300,000 |  |  |  |  |
6.11% (8.60% effective rate) Mortgage Loan due 2017 (Note B) [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal debt amount |  | $ 10,200,000 |  |  |  |  |
Scheduled maturity date |  | Jul. 06, 2017 |  |  |  |  |
Effective interest rate (in hundredths) |  | 8.60% |  |  |  |  |
Mortgage prepayment date |  | Oct. 06, 2016 |  |  |  |  |
Percentage of excess funds after waterfall payments (in hundredths) |  | 50.00% |  |  |  |  |
Stated return on funds deposited in escrow (in hundredths) |  | 10.00% |  |  |  |  |
Fair value of debt assumed in connection with the acquisition |  | $ 1,000,000 |  |  |  |  |
Secured indebtedness [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgages and notes payable | $ 288,623,000 |  |  | 288,623,000 |  |  | 312,868,000
Aggregate undepreciated book value of secured real estate assets | 547,200,000 |  |  | 547,200,000 |  |  |
Unsecured indebtedness [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgages and notes payable | $ 2,190,130,000 |  |  | $ 2,190,130,000 |  |  | $ 1,758,521,000
Subsequent Event [Member] | Revolving Credit Facility due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount outstanding on revolving credit facility |  |  |  |  |  | $ 276,000,000 |
Outstanding letters of credit on revolving credit facility |  |  |  |  |  | 200,000 |
Unused borrowing capacity on revolving credit facility |  |  |  |  |  | $ 198,800,000 |

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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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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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