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Debt Schedule of Outstanding Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Current Portion of Long-Term Debt | $ 30,883 | $ 3,459
Debt and Capital Lease Obligations | 383,279 | 36,194
Less: Unamortized Debt Issuance Costs | (6,440) | 0
Less: Current Maturities of Capital Lease Obligations | (1,470) | 0
Long-Term Debt | 345,956 | 32,735
Bonds |  |
Debt Instrument [Line Items] |  |
Debt and Capital Lease Obligations | 300,000 | 0
Capital Lease Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Debt and Capital Lease Obligations | 3,279 | 51
Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Current Portion of Long-Term Debt | 30,000 |
Less: Current Maturities of Credit Facility Borrowings, Net of Debt Issuance Costs | (29,413) | (3,459)
Debt Instrument, Unamortized Debt Issuance Costs, Current Portion, net | 587 |
JPMorgan, 2017 Credit Agreement | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Debt and Capital Lease Obligations | $ 80,000 |
JPMorgan Chase Bank, National Association, Amended and Restated Credit Agreement | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Debt and Capital Lease Obligations |  | $ 36,143

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