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Debt Debt (Schedule of Unsecured Term Loans) (Details) - Private Placement [Member] - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Unsecured Debt | $ 400,000 | $ 400,000 | $ 400,000
January 2023 [Member] |  |  |
Unsecured Debt |  | $ 125,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.99% |
November 2023 [Member] |  |  |
Unsecured Debt |  | $ 50,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.99% |
September 2024 [Member] |  |  |
Unsecured Debt |  | $ 75,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.93% |
November 2025 [Member] |  |  |
Unsecured Debt |  | $ 50,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.33% |
January 2027 [Member] |  |  |
Unsecured Debt |  | $ 100,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.51% |

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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: 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 2: 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 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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