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Debt Schedule of Outstanding Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |
Notes Payable to Bank | $ 3,926 |
Current Portion of Long-Term Debt | 27,005 | $ 30,883
Debt and Capital Lease Obligations | 355,065 | 376,839
Less: Unamortized Debt Issuance Costs | (4,724) | (6,440)
Less: Current Maturities of Capital Lease Obligations | (1,262) |
Long-Term Debt | 328,060 | 345,956
Bonds |  |
Debt Instrument [Line Items] |  |
Debt and Capital Lease Obligations | 300,000 | 300,000
Capital Lease Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Debt and Capital Lease Obligations | 2,863 | 3,279
Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Current Portion of Long-Term Debt | 25,927 |
Less: Current Maturities of Credit Facility Borrowings, Net of Debt Issuance Costs | (27,005) | (30,883)
Debt Instrument, Unamortized Debt Issuance Costs, Current Portion, net | 184 |
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Additional Repayments of Principal in Next Twelve Months | 15,125 |
Debt Instrument, Unused Borrowing Capacity, Amount | 165,721 |
JPMorgan, 2017 Credit Agreement | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Debt and Capital Lease Obligations | $ 53,000 | $ 80,000

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