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Unsecured Lines Of Credit Payable - Repayments and Borrowings on Unsecured Lines of Credit (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 23, 2015 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
U.S. Covered Terrorism Losses, Percent |  |  |  |  |  | 0.85 |  |
Line of Credit Facility, Periodic Payment, Interest |  |  | $ 2,266,000 | $ 196,000 | $ 867,000 |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Balance at December 31, 2014 |  | $ 50,000,000 | 50,000,000 | 0 |  |  |  |
Balance at December 31, 2015 |  |  | $ 105,000,000 | 50,000,000 | 0 |  |  |
Line Of Credit Extension Term |  |  | 1 year |  |  |  |  |
Line of Credit Facility, Commitment Fee Amount |  |  | $ 1,241,000 | 1,267,000 | 1,267,000 |  |  |
Total revolving credit facilities at December 31 |  |  |  |  |  | $ 600,000,000 | $ 500,000,000 | $ 500,000,000
Lines of credit |  | 50,000,000 | 50,000,000 | 0 | 0 | $ 105,000,000 | $ 50,000,000 | $ 0
Weighted average daily borrowings during the year |  |  | 167,573,000 | 12,849,000 | 61,548,000 |  |  |
Maximum daily borrowings during the year |  |  | $ 350,000,000 | $ 55,000,000 | $ 135,000,000 |  |  |
Weighted average interest rate during the year |  |  | 0.00% | 0.00% | 0.00% |  |  |
Weighted average interest rate at period end |  |  |  |  |  | 0.00% | 0.00% |
Insurance Provider, Covered Terrorism Losses, Percent |  |  |  |  |  | 0.10 |  |
Aggregate Insurance Limit For Terrorism Losses |  |  | $ 100,000,000,000 |  |  |  |  |
Credit Facility No. 1 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Balance at December 31, 2014 |  | 5,000,000 | 5,000,000 |  |  |  |  |
Borrowings |  |  | 3,000,000 |  |  |  |  |
Repayments |  |  | (8,000,000) |  |  |  |  |
Balance at December 31, 2015 |  |  | $ 0 | $ 5,000,000 |  |  |  |
Line of Credit Facility, Expiration Date |  |  | Jun. 30, 2015 |  |  |  |  |
Total revolving credit facilities at December 31 |  |  |  |  |  | $ 100,000,000 |  |
Lines of credit |  | 5,000,000 | $ 5,000,000 | 5,000,000 |  | 0 | $ 5,000,000 |
Credit Facility No 2 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Balance at December 31, 2014 |  | 45,000,000 | 45,000,000 |  |  |  |  |
Borrowings |  |  | 150,000,000 |  |  |  |  |
Repayments |  |  | (195,000,000) |  |  |  |  |
Balance at December 31, 2015 |  |  | $ 0 | 45,000,000 |  |  |  |
Line of Credit Facility, Expiration Date |  |  | Jul. 31, 2016 |  |  |  |  |
Total revolving credit facilities at December 31 |  |  |  |  |  | 400,000,000 |  |
Lines of credit |  | $ 45,000,000 | $ 45,000,000 | $ 45,000,000 |  | 0 | $ 45,000,000 |
credit facility 2015 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Total revolving credit facilities at December 31 |  |  |  |  |  | $ 1,000,000,000 |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
LIBOR Rate |  |  |  |  |  | 0.43% |  |
London Interbank Offered Rate (LIBOR) [Member] | Credit Facility No. 1 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Spread on variable rate |  |  | 1.20% |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Credit Facility No 2 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Spread on variable rate |  |  | 1.20% |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.20% |  |  |  |  |  |
Weighted average interest rate during the year |  | 1.00% |  |  |  |  |  |
Line of Credit [Member] | credit facility 2015 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Borrowings |  |  | $ 445,000,000 |  |  |  |  |
Repayments |  |  | (340,000,000) |  |  |  |  |
Balance at December 31, 2015 |  |  | 105,000,000 |  |  |  |  |
Total revolving credit facilities at December 31 |  |  |  |  |  | $ 600,000,000 |  |
Lines of credit |  |  | $ 105,000,000 |  |  | $ 105,000,000 |  |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Spread on variable rate | 1.00% |  |  |  |  |  |  |
Line of Credit [Member] | Federal Funds Effective Swap Rate [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Spread on variable rate | 0.50% |  |  |  |  |  |  |
Minimum [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage | 0.125% |  |  |  |  |  |  |
Minimum [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Spread on variable rate | 0.875% |  |  |  |  |  |  |
Minimum [Member] | Line of Credit [Member] | Base Rate [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Spread on variable rate | 0.00% |  |  |  |  |  |  |
Maximum [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage | 0.30% |  |  |  |  |  |  |
Maximum [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Spread on variable rate | 1.55% |  |  |  |  |  |  |
Maximum [Member] | Line of Credit [Member] | Base Rate [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Spread on variable rate | 0.55% |  |  |  |  |  |  |

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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 Amount of the fee for available but unused credit capacity under the credit facility. + 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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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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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- Definition The effective interest rate during the reporting period. + 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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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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