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Debt and Credit Facilities - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
May 10, 2019 | Jul. 01, 2014 | Jan. 31, 2019 | Mar. 31, 2019 | Mar. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance costs incurred |  |  |  | $ 500,000 |  |
Letters of credit outstanding amount |  |  |  | 227,700,000 |  | $ 223,000,000
Amortization of debt issue costs |  |  |  | 244,000 | $ 149,000 |
Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest expense |  |  |  | 1,400,000 |  |
Debt Amount |  |  | $ 150,000,000 |  | 0 |
Term Loan | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of outstanding balance | $ 150,000,000 |  |  |  |  |
Accrued Expenses and Other Current Liabilities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest payable |  |  |  | 2,600,000 |  | 5,700,000
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest expense |  |  |  | 3,100,000 | 3,100,000 |
Interest payments |  |  |  | 6,200,000 | 6,200,000 |
Private Placement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance costs incurred |  |  |  | $ 1,100,000 |  |
Repayment of outstanding balance |  | $ 250,000,000 |  |  |  |
Base Rate | Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  |  | 0.25% |  |  |
Debt instrument, interest rate terms |  |  | The Base Rate Loans bear interest at a rate per annum of the sum of (a) the highest of (1) the administrative agent’s reference rate; (2) the rate equal to 1.50% per annum above the Offshore Rate; and (3) the rate equal to 0.50% per annum above the latest federal funds rate, plus (b) 0.25%. |  |  |
Debt instrument interest rate above the offshore rate |  |  | 1.50 |  |  |
Debt instrument interest above the latest federal funds rate |  |  | 0.50 |  |  |
Offshore Rate | Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Margin interest rate |  |  | 1.25% |  |  |
Debt instrument, interest rate terms |  |  | The Offshore Rate Loans bear interest at a rate per annum of LIBOR, divided by 1.00 minus the Eurodollar Reserve Percentage, plus 1.25%. |  |  |
Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amended and restated credit agreement date |  |  |  | Nov. 30, 2017 |  |
Debt issuance costs incurred |  |  |  | $ 2,000,000 |  |
Revolving credit facility |  |  |  | 500,000,000 |  |
Increase in revolving credit facility |  |  |  | $ 550,000,000 |  |
Credit agreement extended date |  |  |  | Nov. 30, 2022 |  |
Letters of credit outstanding amount |  |  |  | $ 49,800,000 | $ 0 | $ 48,800,000
Interest expense |  |  |  | $ 3,400,000 |  |
Credit Agreement | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  |  |  | 4.253% |  |
Credit Agreement | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  |  |  |  |  | 4.267%
Credit Agreement | Base Rate | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Margin interest rate |  |  |  | 0.125% |  |
Credit Agreement | Base Rate | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Margin interest rate |  |  |  | 1.00% |  |
Credit Agreement | LIBOR | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Margin interest rate |  |  |  | 1.125% |  |
Credit Agreement | LIBOR | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Margin interest rate |  |  |  | 2.00% |  |

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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