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Debt (Details) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 21, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 15, 2018
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt |  | $ 61,597,000 | $ 900,000 |
2021 Revolving Credit Facility | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  |  | $ 255,000,000
2020 Revolving Credit Facility | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  |  | $ 95,000,000
2023 Revolving Credit Facility | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  | 350,000,000 |  |
Remaining borrowing capacity |  | $ 350,000,000 |  |
2023 Revolving Credit Facility | Revolving Credit Facility | Federal Funds Effective Swap Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate on which basis spread is calculated |  | 0.50% |  |
2023 Revolving Credit Facility | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate on which basis spread is calculated |  | 1.00% |  |
Basis spread on variable rate |  | 2.75% |  |
2023 Revolving Credit Facility | Revolving Credit Facility | Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.75% |  |
2023 Revolving Credit Facility | Revolving Credit Facility | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment fee percentage |  | 0.375% |  |
2023 Revolving Credit Facility | Revolving Credit Facility | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment fee percentage |  | 0.50% |  |
Prime Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repurchased face amount | $ 594,000,000 |  |  |
Loss on extinguishment of debt | $ 62,000,000 |  |  |

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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