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Mortgages and Notes Payable (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) extensions | Apr. 18, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |
Mortgages and notes payable | $ 2,042,486 |  | $ 1,948,047
Unamortized debt issuance costs | $ (8,564) |  | (6,302)
Maximum liquidity requirements (in years) | 1 year |  |
Revolving Credit Facility due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity on revolving credit facility | $ 475,000 |  |
Maturity date on revolving credit facility | Jan. 01, 2018 |  |
Additional borrowing capacity on revolving credit facility | $ 75,000 |  |
Number of additional maturity extensions | extensions | 2 |  |
Term of optional extension | 6 months |  |
Interest rate, basis spread (in hundredths) | 1.10% |  |
Annual facility fee (in hundredths) | 0.20% |  |
Amount outstanding on revolving credit facility | $ 131,000 |  |
Outstanding letters of credit on revolving credit facility | 200 |  |
Unused borrowing capacity on revolving credit facility | 343,800 |  |
3.875% (4.038% effective rate) Notes due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal debt amount | $ 300,000 |  |
Interest rate (in hundredths) | 3.875% |  |
Scheduled maturity date | Mar. 01, 2027 |  |
Original issue discount | $ 4,000 |  |
Effective interest rate (in hundredths) | 4.038% |  |
Debt issuance costs incurred | $ 2,500 |  |
5.85% (5.88% effective rate) Notes due 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal debt amount | $ 379,700 |  |
Interest rate (in hundredths) | 5.85% |  |
Variable Rate Term Loan due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal debt amount | $ 150,000 |  |
Variable Rate Term Loan (amended) due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, basis spread (in hundredths) | 1.10% |  |
Principal debt amount | $ 200,000 |  |
Scheduled maturity date | Jan. 01, 2022 |  |
Debt issuance costs incurred | $ 300 |  |
Secured Loan due November 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal debt amount | $ 108,300 |  |
Scheduled maturity date | Nov. 01, 2017 |  |
Unsecured Notes due April 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal debt amount | $ 200,000 |  |
Scheduled maturity date | Apr. 15, 2018 |  |
Anticipated Fixed Rate Secured Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal debt amount | $ 100,000 |  |
Secured indebtedness [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgages and notes payable | 127,358 |  | 128,204
Aggregate undepreciated book value of secured real estate assets | 254,200 |  |
Unsecured indebtedness [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgages and notes payable | $ 1,923,692 |  | $ 1,826,145
Subsequent Event [Member] | Revolving Credit Facility due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Amount outstanding on revolving credit facility |  | $ 130,000 |
Outstanding letters of credit on revolving credit facility |  | 200 |
Unused borrowing capacity on revolving credit facility |  | $ 344,800 |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Facility interest rate basis | LIBOR plus 110 basis points |  |
London Interbank Offered Rate (LIBOR) [Member] | Variable Rate Term Loan (amended) due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest rate basis | LIBOR plus 110 basis points |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 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=64930785&loc=d3e28551-108399 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + 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 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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