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Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ (1,720) | $ (1,794)
Long-term debt, excluding current portion | 583,339 | 580,286
Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 583,339 | 580,286
Current portion of long-term debt | 0 | 0
Long-term debt, excluding current portion | $ 583,339 | $ 580,286
Series D Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 6.39% | 6.39%
Maturity date | Oct. 01, 2018 | Oct. 01, 2018
Long-term Debt | $ 100,000 | $ 100,000
Series F Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 8.24% | 8.24%
Maturity date | Apr. 03, 2019 | Apr. 03, 2019
Long-term Debt | $ 43,000 | $ 43,000
Series J Notes [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate | 2.69% |
Variable interest rate | 2.69% |
Series J Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Basis Spread On Variable Rate | 1.25% | 1.25%
Maturity date | Nov. 15, 2020 | Nov. 15, 2020
Long-term Debt | $ 50,000 | $ 50,000
Series G Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.42% | 3.42%
Maturity date | Nov. 15, 2020 | Nov. 15, 2020
Long-term Debt | $ 50,000 | $ 50,000
Series H Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.03% | 4.03%
Maturity date | Nov. 15, 2023 | Nov. 15, 2023
Long-term Debt | $ 25,000 | $ 25,000
Series I Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.18% | 4.18%
Maturity date | Nov. 15, 2025 | Nov. 15, 2025
Long-term Debt | $ 25,000 | $ 25,000
Series K Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.03% | 4.03%
Maturity date | Nov. 15, 2023 | Nov. 15, 2023
Long-term Debt | $ 50,000 | $ 50,000
Series L Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.18% | 4.18%
Maturity date | Nov. 15, 2025 | Nov. 15, 2025
Long-term Debt | $ 50,000 | $ 50,000
Series M Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.12% | 1.12%
Maturity date | Sep. 23, 2026 | Sep. 23, 2026
Long-term Debt | $ 48,015 | $ 47,270
Series N Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.31% | 1.31%
Maturity date | Sep. 23, 2028 | Sep. 23, 2028
Long-term Debt | $ 92,428 | $ 90,995
Series O Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.57% | 1.57%
Maturity date | Sep. 23, 2031 | Sep. 23, 2031
Long-term Debt | $ 51,616 | $ 50,815
Revolving Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Variable Rate Basis | LIBOR |
Revolving Credit Agreement [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Basis Spread On Variable Rate | 0.85% |
Revolving Credit Agreement [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Basis Spread On Variable Rate | 1.65% |

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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, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 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 3: 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 + Details
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