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Debt and Credit Agreements - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 17, 2015 | May 31, 2016 USD ($) | Sep. 30, 2014 USD ($) Investor Tranche | Dec. 31, 2010 USD ($) Investor Tranche | Jul. 31, 2008 USD ($) Investor Tranche | Jun. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) fiscal_period | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 19, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  | $ 87,000,000 |  |  |
2021 |  |  |  |  |  |  | 188,000,000 |  |  |
2023 |  |  |  |  |  |  | 62,000,000 |  |  |
Repayments of debt |  |  |  |  |  |  | 455,000,000 | $ 0 | $ 587,000,000 |
Loss on repurchase of debt |  |  |  |  |  |  | 0 | 0 | $ 4,709,000 |
Deferred financing costs capitalized |  |  |  |  |  |  | $ 4,896,000 | $ 6,109,000 |  |
6.51% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate (as a percent) |  |  |  |  |  |  | 6.51% | 6.51% |  |
Long-term debt including unamortized debt issuance costs |  |  |  |  |  |  | $ 124,000,000 | $ 361,000,000 |  |
9.78% senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 9.78% | 9.78% |  |
Long-term debt including unamortized debt issuance costs |  |  |  |  |  |  | $ 0 | $ 67,000,000 |  |
5.58% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate (as a percent) |  |  |  |  |  |  | 5.58% | 5.58% |  |
Long-term debt including unamortized debt issuance costs |  |  |  |  |  |  | $ 175,000,000 | $ 175,000,000 |  |
3.65% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate (as a percent) |  |  |  |  |  |  | 3.65% | 3.65% |  |
Long-term debt including unamortized debt issuance costs |  |  |  |  |  |  | $ 925,000,000 | $ 925,000,000 |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity on line of credit |  |  |  |  |  |  | $ 1,800,000,000 |  |  | $ 1,700,000,000
Minimum required asset coverage ratio |  |  |  |  |  |  | 1.75 |  |  |
Fiscal quarters for reduction in coverage ratio | fiscal_period |  |  |  |  |  |  | 4 |  |  |
Minimum required annual coverage ratio |  |  |  |  |  |  | 2.8 |  |  |
Maximum borrowing capacity on line of credit |  |  |  |  |  |  |  |  |  | $ 3,200,000,000.0
Minimum current ratio |  |  |  |  |  |  | 1.0 |  |  |
Long-term debt including unamortized debt issuance costs |  |  |  |  |  |  | $ 7,000,000 | $ 0 |  |
Interest rate during period |  |  |  |  |  |  | 6.30% |  | 2.30% |
Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum required asset coverage ratio |  |  |  |  |  |  | 1.75 |  |  |
Fiscal quarters for reduction in coverage ratio | fiscal_period |  |  |  |  |  |  | 4 |  |  |
Minimum required annual coverage ratio |  |  |  |  |  |  | 2.8 |  |  |
Senior Notes | 6.51% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 301,000,000 |  |  |
Principal |  |  |  |  | $ 425,000,000 |  |  |  |  |
Number of institutional investors | Investor |  |  |  |  | 41 |  |  |  |  |
Number of debt tranches | Tranche |  |  |  |  | 3 |  |  |  |  |
Senior Notes | 5.58% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  |  | $ 175,000,000 |  |  |  |  |  |
Number of institutional investors | Investor |  |  |  | 8 |  |  |  |  |  |
Number of debt tranches | Tranche |  |  |  | 3 |  |  |  |  |  |
Senior Notes | 3.65% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  | $ 925,000,000 |  |  |  |  |  |  |
Number of institutional investors | Investor |  |  | 24 |  |  |  |  |  |  |
Number of debt tranches | Tranche |  |  | 3 |  |  |  |  |  |  |
Minimum | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unused capacity fee percentage | 0.30% |  |  |  |  |  |  |  |  |
Maximum | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unused capacity fee percentage | 0.50% |  |  |  |  |  |  |  |  |
Senior Notes | 6.51% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  | $ 64,000,000 |  |  |  |  |  |  |  |
Repayments of debt |  | 68,300,000 |  |  |  |  |  |  |  |
Loss on repurchase of debt |  |  |  |  |  | $ 4,700,000 |  |  |  |
Tranche 1 | Senior Notes | 6.51% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | $ 245,000,000 |  |  |  |  |
Term |  |  |  |  | 10 years |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 6.44% |  |  |  |  |
Tranche 1 | Senior Notes | 5.58% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  |  | $ 88,000,000 |  |  |  |  |  |
Term |  |  |  | 10 years |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.42% |  |  |  |  |  |
Tranche 1 | Senior Notes | 3.65% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  | $ 100,000,000 |  |  |  |  |  |  |
Term |  |  | 7 years |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.24% |  |  |  |  |  |  |
Tranche 1 | Senior Notes | 6.51% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  | 8,000,000 |  |  |  |  |  |  |  |
Tranche 2 | Senior Notes | 6.51% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | $ 100,000,000 |  |  |  |  |
Term |  |  |  |  | 12 years |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 6.54% |  |  |  |  |
Tranche 2 | Senior Notes | 5.58% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  |  | $ 25,000,000 |  |  |  |  |  |
Term |  |  |  | 12 years |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.59% |  |  |  |  |  |
Tranche 2 | Senior Notes | 3.65% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  | $ 575,000,000 |  |  |  |  |  |  |
Term |  |  | 10 years |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.67% |  |  |  |  |  |  |
Tranche 2 | Senior Notes | 6.51% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  | 13,000,000 |  |  |  |  |  |  |  |
Tranche 3 | Senior Notes | 6.51% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | $ 80,000,000 |  |  |  |  |
Term |  |  |  |  | 15 years |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 6.69% |  |  |  |  |
Tranche 3 | Senior Notes | 5.58% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  |  | $ 62,000,000 |  |  |  |  |  |
Term |  |  |  | 15 years |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.80% |  |  |  |  |  |
Tranche 3 | Senior Notes | 3.65% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal |  |  | $ 250,000,000 |  |  |  |  |  |  |
Term |  |  | 12 years |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.77% |  |  |  |  |  |  |
Tranche 3 | Senior Notes | 6.51% weighted-average senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of principal repurchased |  | $ 43,000,000 |  |  |  |  |  |  |  |
LIBOR | Minimum | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 0.50% |  |  |
LIBOR | Maximum | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 2.25% |  |  |

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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