Debt Instrument Offer Price Percentage

No definition available.

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- Definition

Redemption Price Percent If Change in Control Occurs

+ References

No definition available.

+ Details

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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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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Period Type:	duration

- 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

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- Details

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- Details

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- Details

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Long-Term Debt 5% Senior Notes (Details) - USD ($)		3 Months Ended		12 Months Ended
Long-Term Debt 5% Senior Notes (Details) - USD ($)	Apr. 03, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 23, 2012
Gain (Loss) on Extinguishment of Debt		$ (4,400,000)	$ (2,700,000)	$ (7,052,000)	$ 0	$ 0
Senior Notes [Member] \| Five Percent Senior Notes due 2020 [Member]
Debt Instrument Offering Price Percentage							100.00%
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest	101.25%
Redemption Price Percent If Change In Control Occurs in Addition to Accrued and Unpaid Interest							101.00%
Debt Instrument, Face Amount							$ 500,000,000
Early Repayment of Senior Debt	$ 220,000,000.0
Gain (Loss) on Extinguishment of Debt		$ (4,400,000)
Debt Instrument, Redemption - Current Percent \| Five Percent Senior Notes due 2020 [Member]
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest				101.25%
Debt Instrument, Redemption - After April 1, 2018 \| Five Percent Senior Notes due 2020 [Member]
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest				100.00%