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Fair Value Measurements (Fair Value of Long-term Borrowings Outstanding) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Debt instrument term | 15 years |
Carrying Amount |  |
Debt Instrument [Line Items] |  |
Fair value of long-term borrowings | $ 288,942 | $ 306,421
Carrying Amount | Fixed rate long-term notes payable |  |
Debt Instrument [Line Items] |  |
Fair value of long-term borrowings | 261,618 | 275,989
Carrying Amount | Debenture bonds |  |
Debt Instrument [Line Items] |  |
Fair value of long-term borrowings | 27,324 | 30,432
Fair Value | Level 2 |  |
Debt Instrument [Line Items] |  |
Fair value of long-term borrowings | 282,601 | 304,792
Fair Value | Level 2 | Fixed rate long-term notes payable |  |
Debt Instrument [Line Items] |  |
Fair value of long-term borrowings | 256,447 | 275,340
Fair Value | Level 2 | Debenture bonds |  |
Debt Instrument [Line Items] |  |
Fair value of long-term borrowings | $ 26,154 | $ 29,452

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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