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Debt:2024 Notes (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2016 | Aug. 29, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ (3,000) | $ (5,900) | $ 0 | $ (14,304) | $ 0
5.625% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 350,000 |  |  |  |  |
Interest rate |  | 5.625% |  |  | 5.625% |  |
Dividend restriction, consolidated coverage ratio (as a percent) |  |  |  |  | 200.00% |  |
6.375% Senior Notes Due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 300,000 |  |  |  |  |
Interest rate |  | 6.375% |  |  |  |  |
Extinguishment of Debt, Amount | $ 115,500 | $ 184,500 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | (14,300) |
Debt extinguishment premiums paid |  |  |  |  |  | (11,300) |
Write off of Deferred Debt Issuance Cost |  |  |  |  |  | $ (3,000) |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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