Face (par) amount of debt instrument at time of issuance.

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 715
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Fair Value Measurements Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
Fair Value Measurements Narrative (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Level 1
Fair Value Measurements [Line Items]
Defined benefit plan, transfers between measurement levels	$ 0	$ 0
Level 2
Fair Value Measurements [Line Items]
Defined benefit plan, transfers between measurement levels	0	0
Level 3
Fair Value Measurements [Line Items]
Defined benefit plan, transfers between measurement levels	0	0
Senior \| $250 Million Senior Notes
Fair Value Measurements [Line Items]
Debt instrument face amount	250,000,000	250,000,000	$ 250,000,000
Senior \| $250 Million Senior Notes \| Level 2
Fair Value Measurements [Line Items]
Debt instrument fair value	260,300,000	260,300,000	269,200,000
Senior \| $400 Million Senior Notes
Fair Value Measurements [Line Items]
Debt instrument face amount	400,000,000	400,000,000	400,000,000
Senior \| $400 Million Senior Notes \| Level 2
Fair Value Measurements [Line Items]
Debt instrument fair value	$ 423,000,000	$ 423,000,000	$ 440,100,000