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Long-term Debt - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Senior notes | $ 45,000 | $ 45,000 |
Debt instrument, due date | Jan. 03, 2021 |  |
Fixed interest rate | 4.79% |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.10% |  |
Letter of Credit Fee in Percentage | 1.00% |  |
Letters of Credit Outstanding, Amount | $ 48,900 | $ 61,500 |
Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Spread added to Rate | 0.00% |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.10% |  |
Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Spread added to Rate | 0.375% |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.175% |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Spread added to Rate | 1.00% |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Spread added to Rate | 1.375% |  |
2019 Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Original borrowing capacity | $ 250,000 |  |
Line of Credit Facility Accordion | 150,000 |  |
Line of Credit Facility, Maximum Borrowing Capacity | 400,000 |  |
Letter of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases | $ 100,000 |  |
Prior Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 300,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.125% | 0.125% |
Letter of Credit Fee in Percentage | 1.00% | 1.00% |
Unsecured Senior Note Due January 3, 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Scheduled principal payment | $ 45,000 |  |

X
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- Definition Amount of original borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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