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Long-Term Debt (Senior Credit Facility) (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 18, 2019 USD ($) | Sep. 11, 2014 USD ($) | Dec. 31, 2019 USD ($) | Dec. 19, 2012 USD ($)
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity under credit facility |  | $ 500,000 |  | $ 300,000
Basis spread on debt instrument |  | 0.70% |  |
Commitment fee percentage |  | 0.30% |  |
Senior Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity under credit facility | $ 1,800,000,000 |  |  |
Commitment fee percentage |  |  | 0.11% |
Maximum permitted consolidated net leverage ratio | 4.00 |  |  |
Unamortized financing costs | $ 3,405,000 |  |  |
Utilized borrowings under credit facility |  |  | $ 733,536,000 |
Available amount under credit facility |  |  | 1,066,464,000 |
Senior Credit Facility | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee percentage | 0.09% |  |  |
Consolidated interest coverage ratio | 3.0 |  |  |
Senior Credit Facility | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee percentage | 0.20% |  |  |
Consolidated net leverage ratio | 3.75 |  |  |
Senior Credit Facility | Borrowings |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Utilized borrowings under credit facility |  |  | 16,803,000 |
Senior Credit Facility | Standby letters of credit related to various insurance contracts and foreign vendor commitments |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Utilized borrowings under credit facility |  |  | $ 22,787,000 |
Senior Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on debt instrument |  |  | 1.125% |
Senior Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on debt instrument | 1.00% |  |  |
Senior Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on debt instrument | 1.75% |  |  |
Senior Credit Facility | Federal Funds Effective Swap Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on debt instrument | 0.50% |  |  |
Senior Credit Facility | Monthly LIBOR |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on debt instrument | 1.00% |  | 0.125% |
Senior Credit Facility | Monthly LIBOR | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on debt instrument | 0.00% |  |  |
Senior Credit Facility | Monthly LIBOR | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on debt instrument | 0.75% |  |  |
2019 Senior Secured Credit Facility Amendment |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Unamortized financing costs |  |  | $ 2,264,000 |
Commercial Paper |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Utilized borrowings under credit facility |  |  | $ 693,946,000 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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=6876686&loc=d3e534808-122878 Reference 3: 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(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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=6877327&loc=d3e13212-122682 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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