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Debt (Narrative) (Details) - USD ($) |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 03, 2016 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 02, 2020 | Dec. 31, 2019
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Interest rate description |  | At the Company’s election, borrowings under the 2020 Credit Agreement bear interest at either: (1) a base rate plus a margin of 0.00% to 0.75%, based on certain financial tests, or (2) United States dollar LIBOR (0.18% at June 30, 2020) plus 1.00% to 1.75%, based on certain financial tests. The base rate is determined by the greater of (a) the prime commercial lending rate announced by Bank of Montreal from time to time (3.25% at June 30, 2020), (b) the federal funds effective rate, plus 1/2 of 1.00%, (c) the daily one month LIBOR rate, plus 1.00%, or (d) 0.00%. The interest rate in effect at June 30, 2020 was 1.18%. Fees for letters of credit issued under the 2020 Revolving Credit Facility range from 0.75% to 1.75% of the respective face amounts of outstanding letters of credit, depending on the nature of the letter of credit, and are computed based on certain financial tests. |  |  |  |  |
Repayments of long-term debt (in US dollars) |  | $ 257,549,000 | $ 7,601,000 |  |  |  |
Letters of credit outstanding (in US dollars) |  | 79,000,000.0 |  |  |  |  | $ 109,000,000.0
Borrowings under revolving credit facility (in US dollars) |  | $ 0 |  |  |  |  | 50,000,000
2016 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit agreement, initiation date | Aug. 03, 2016 |  |  |  |  |  |
2016 Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Borrowings under revolving credit facility (in US dollars) |  |  |  |  |  |  | 50,000,000
2016 Term Loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term Loan (in US dollars) | $ 400,000,000.0 |  |  |  |  |  | $ 254,431,000
2020 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Expiration date of credit agreement |  | Mar. 02, 2025 |  |  |  |  |
Interest rate |  | 1.18% |  |  |  |  |
Debt issuance costs |  | $ 3,100,000 |  |  |  |  |
2020 Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Borrowings under revolving credit facility (in US dollars) |  | 0 |  |  |  |  |
2020 Term Loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term Loan (in US dollars) |  | $ 300,000,000 |  |  |  | $ 300,000,000.0 |
Base Rate [Member] | Minimum [Member] | 2020 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.00% |  |  |  |  |
Base Rate [Member] | Maximum [Member] | 2020 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.75% |  |  |  |  |
Prime Rate, Bank of Montreal [Member] | 2020 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commercial lending rate |  | 3.25% |  |  |  |  |
Credit Agreement Base Rate, Daily One Month LIBOR Rate [Member] | 2020 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | 2020 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commercial lending rate |  | 0.18% |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | 2020 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | 2020 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.75% |  |  |  |  |
Credit Agreement Base Rate, Federal Funds Rate [Member] | 2016 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |  |  |
Credit Agreement, 0% Base Rate [Member] | 2020 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.00% |  |  |  |  |
Revolving Credit Facility [Member] | 2016 Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity (in US dollars) | $ 900,000,000.0 |  |  |  |  |  |
Revolving Credit Facility [Member] | 2020 Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity (in US dollars) |  |  |  |  |  | $ 1,300,000,000 |
Increase in borrowing capacity (in US dollars) |  | $ 1,900,000,000 |  |  |  |  |
Letters of credit maximum borrowing capacity (in US dollars) |  | $ 400,000,000.0 |  |  |  |  |
Commitment fee percentage of unused amount |  | 0.10% |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | 2020 Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage of unused amount |  | 0.10% |  |  |  |  |
Letter of credit fees |  | 0.75% |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | 2020 Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage of unused amount |  | 0.25% |  |  |  |  |
Letter of credit fees |  | 1.75% |  |  |  |  |
Subsequent Event | 2020 Term Loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loan, annual principal payments (in US dollars) |  |  |  | $ 15,000,000.0 | $ 7,500,000 |  |

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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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