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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Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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Debt Obligations - Senior Notes (Details) - USD ($)	1 Months Ended		3 Months Ended
Debt Obligations - Senior Notes (Details) - USD ($)	Aug. 31, 2017	Jul. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Proceeds from borrowings			$ 44,000,000	$ 75,000,000
Senior Notes \| 2025 Notes
Debt Instrument [Line Items]
Interest rate on senior unsecured notes	4.375%
Aggregate principal amount	$ 400,000,000
Proceeds from borrowings	$ 394,000,000
Senior Notes \| 2024 Notes
Debt Instrument [Line Items]
Interest rate on senior unsecured notes		5.50%
Aggregate principal amount		$ 375,000,000
Proceeds from borrowings		$ 370,000,000