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Long-Term Debt (Details) - USD ($) |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 26, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Nov. 01, 2016 | Nov. 11, 2013
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity, Current |  | $ 100,000,000.0 |  | $ 175,000,000.0 | $ 250,000,000.0
Allowable Amount For Issuance of Letters of Credit |  | $ 30,000,000.0 |  |  | $ 20,000,000.0
Debt Instrument, Covenant, Leverage Ratio |  | 2 |  |  |
Debt Covenant, Minimum Net Income Requirement |  | $ 1.00 |  |  |
Debt Covenant, Minimum Tangible Net Worth |  | 250,000,000.0 |  |  |
Noncash or Part Noncash Acquisition, Debt Assumed | $ 93,300,000 |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  | 53,500,000 | $ 0.0 |  |
Letters of Credit Outstanding, Amount |  | 11,300,000 |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 88,700,000 |  |  |
Prime Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.00% |  |  |
Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.0725% |  |  |
Long Term Debt, Interest Rate at Period End |  | 3.13% |  |  |
Long-term Debt, Term |  | 36 months |  |  |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.70% |  |  |
Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.175% |  |  |
Long Term Debt, Interest Rate at Period End |  | 5.17% |  |  |
Long-term Debt, Term |  | 84 months |  |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.90% |  |  |
Accordion Feature [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity, Current |  | $ 100,000,000.0 |  |  |

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- Definition Allowable amount for issuance of letters of credit under the credit facility. + References No definition available. + Details
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