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

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

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(iv)(02)(C)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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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, 2017	Sep. 30, 2017	Dec. 31, 2016	Jun. 27, 2012	Aug. 25, 2010
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		$ 250,000,000
Senior \| $250 Million Senior Notes \| Level 2
Fair Value Measurements [Line Items]
Debt instrument fair value	270,900,000	270,900,000	273,000,000
Senior \| $400 Million Senior Notes
Fair Value Measurements [Line Items]
Debt instrument face amount	400,000,000	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	$ 446,200,000	$ 446,200,000	$ 430,400,000