Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Level 1
Fair Value Measurements [Line Items]
Defined benefit plan, transfers between measurement levels	$ 0
Level 2
Fair Value Measurements [Line Items]
Defined benefit plan, transfers between measurement levels	0
Level 3
Fair Value Measurements [Line Items]
Defined benefit plan, transfers between measurement levels	0
Senior \| $250 Million Senior Notes
Fair Value Measurements [Line Items]
Debt instrument face amount	250,000,000	$ 250,000,000
Senior \| $250 Million Senior Notes \| Level 2
Fair Value Measurements [Line Items]
Debt instrument fair value	258,200,000	257,000,000
Senior \| $400 Million Senior Notes
Fair Value Measurements [Line Items]
Debt instrument face amount	400,000,000	400,000,000
Senior \| $400 Million Senior Notes \| Level 2
Fair Value Measurements [Line Items]
Debt instrument fair value	$ 426,900,000	$ 415,700,000

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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Balance Type:	credit
Period Type:	instant

- 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
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)(C)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921

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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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