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Debt and Credit Agreements - Narrative (Details) |  | 9 Months Ended |
--- | --- | --- | ---
Apr. 22, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |
Debt issuance costs |  | $ 4,210,000 | $ 4,896,000
Unamortized costs |  | $ 3,400,000 |
Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing base | $ 3,200,000,000 |  |
Remaining borrowing capacity | $ 1,500,000,000 |  |
Minimum asset coverage ratio |  | 1.75 |
Minimum annual coverage ratio, consolidated cash flow to interest expense |  | 2.8 |
Minimum current ratio |  | 1.0 |
Long-term Debt, Gross |  | $ 0 | $ 7,000,000
Line of credit |  | 1,500,000,000 |
Debt issuance costs |  | $ 7,400,000 |
Revolving credit facility | Minimum | Non Investment Grade |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percent | 0.30% |  |
Revolving credit facility | Minimum | Non Investment Grade | ABR Loans |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 0.50% |  |
Revolving credit facility | Minimum | Non Investment Grade | LIBOR Loans |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 1.50% |  |
Revolving credit facility | Minimum | Investment Grade |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percent | 0.125% |  |
Revolving credit facility | Minimum | Investment Grade | ABR Loans |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 0.125% |  |
Revolving credit facility | Minimum | Investment Grade | LIBOR Loans |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 1.125% |  |
Revolving credit facility | Maximum | Non Investment Grade |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percent | 0.425% |  |
Revolving credit facility | Maximum | Non Investment Grade | ABR Loans |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 1.25% |  |
Revolving credit facility | Maximum | Non Investment Grade | LIBOR Loans |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 2.25% |  |
Revolving credit facility | Maximum | Investment Grade |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percent | 0.275% |  |
Revolving credit facility | Maximum | Investment Grade | ABR Loans |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 0.75% |  |
Revolving credit facility | Maximum | Investment Grade | LIBOR Loans |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 1.75% |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)(1) -URI http://asc.fasb.org/extlink&oid=109500613&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(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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 4: 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 + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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- 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 The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + 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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