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Long-Term Debt - Additional Information (Details) |  | 12 Months Ended
--- | --- | ---
May 17, 2017 USD ($) Bank | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Credit facility syndication, number of commercial banks | Bank | 11 |  |  |
Line of credit facility, expiration date |  | May 17, 2022 |  |
Line of credit facility, maximum borrowing capacity without borrowing base requirement | $ 600,000,000 |  |  |
Line of credit facility, accordion feature, additional revolving credit commitments under existing loan facility | 300,000,000 |  |  |
New syndicated borrowings used to pay off or pay down borrowings from syndicate members | 106,000,000 |  |  |
Line of credit facility, maximum borrowing capacity | $ 60,000,000 |  |  |
Line of credit facility, interest coverage ratio covenant | 300.00% |  |  |
Line of credit facility, leverage ratio covenant | 375.00% |  |  |
Line of credit facility, interest rate during period |  | 0.15% | 0.15% |
Line of credit facility, remaining borrowing capacity |  | $ 396,300,000 |  |
Line of credit facility, current borrowing capacity |  | 284,300,000 |  |
Debt issuance costs, net |  | 6,900,000 | $ 6,900,000 |
Accumulated amortization, debt issuance costs |  | 5,200,000 | 4,700,000 |
Amortization of debt issuance costs |  | $ 510,000 | $ 673,000 | $ 532,000
Number of letters of credit, outstanding |  | 11 | 12 |
Letters of credit outstanding, amount |  | $ 3,300,000 | $ 3,700,000 |
Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Committement Fee Unused Capacity |  | 0.13% |  |
Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Committement Fee Unused Capacity |  | 0.25% |  |
Federal Funds Open Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate | 0.50% |  |  |
London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.25% |  |
London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.00% |  |
London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |  |

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- Definition Represents line of credit facility accordion feature additional revolving credit commitments under existing loan facility. + References No definition available. + Details
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- Definition Represents the minimum interest coverage ratio under the credit facility's financial covenants. + References No definition available. + Details
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- Definition Represents the funds from new syndicated borrowings used to pay off or pay down borrowings from syndicate members. + References No definition available. + Details
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