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Notes Payable (Narrative) (Details) $ in Thousands | 1 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2017 | Feb. 28, 2017 USD ($) | Aug. 31, 2015 USD ($) | May 15, 2017 USD ($) | Dec. 31, 2017 USD ($) yr | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | May 12, 2017 USD ($)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  |  |  |  | $ 12,300 | $ 15,700 |  |
Unsecured Debt |  |  |  |  |  | 1,338,628 | 1,583,236 |  |
Total notes payable |  |  |  |  |  | 2,204,600 | 2,480,600 |  |
Loss on early retirement of debt |  |  |  |  |  | 323 | 0 | $ 0 |
Available amount under unsecured credit facility |  |  |  |  |  | $ 586,600 |  |  |
Repayments of Secured Debt |  |  | $ 30,700 |  |  |  |  |  |
Weighted average interest rate on floating rate debt | [1] |  |  |  |  | 4.30% |  |  |
Weighted average maturity of indebtedness (including unsecured credit facility and unsecured short-term borrowings) (in years) | yr |  |  |  |  |  | 4.3 |  |  |
Short-term Debt [Member] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under unsecured credit facility |  |  |  |  |  |  |  |  | $ 45,000
Debt Instrument, Maturity Date |  |  |  |  |  | May 14, 2018 |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.95% |  |  |  |  |  |  |
Available amount under unsecured credit facility |  |  |  |  |  | $ 45,000 |  |  |
Other Short-term Borrowings |  |  |  |  |  | 0 |  |  |
Letter Of Credit [Member] |  |  |  |  |  |  |  |  |
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility |  |  |  |  |  | 50,000 |  |  |
Outstanding balance under credit facility |  |  |  |  |  | 13,400 |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  | 1,338,600 | 1,583,200 |  |
Five Point Eight three Percentage Notes Due2017 [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  | $ 0 | 246,600 |  |
Debt Instrument, Maturity Date |  |  |  |  |  | May 15, 2017 |  |  |
Notes payable, effective interest rate |  |  |  |  |  | 5.83% |  |  |
Repayments of Unsecured Debt |  |  |  |  | $ 246,800 |  |  |  |
Unsecured Credit Facility [Member] |  |  |  |  |  |  |  |  |
Value not exceeding the amount available under the unsecured credit facility |  |  |  |  |  | $ 300,000 |  |  |
Amount of current borrowing capacity under unsecured credit facility |  |  |  | $ 500,000 |  | 600,000 |  |  |
Maximum borrowing capacity under unsecured credit facility |  |  |  |  |  | $ 900,000 |  |  |
Terms Of Bid Rate Loans |  |  |  |  |  | 180 |  |  |
Unsecured Credit Facility, Expiration Date |  |  |  | Sep. 22, 2015 |  | Aug. 07, 2019 |  |  |
Option to extend the period of unsecured credit facility |  |  |  |  |  | August 2020 |  |  |
Floating Rate Notes Payable [Member] |  |  |  |  |  |  |  |  |
Total notes payable |  |  |  |  |  | $ 175,000 | $ 205,700 |  |
Weighted average interest rate on floating rate debt |  |  |  |  |  | 1.90% | 1.40% |  |
[1] | Includes all available extension options.

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- Definition Option to extend the period of unsecured credit facility. + References No definition available. + Details
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- Definition Maximum term of bid rate loans in days related to the line of credit. Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates + References No definition available. + Details
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- Definition Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates. These bid rate loans have terms of 180 days or less and may not exceed the lesser of $250 million or the remaining amount available under the line of credit. + References No definition available. + Details
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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=64930785&loc=d3e28551-108399 + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance 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 Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + 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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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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(a)(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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