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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Consolidating Condensed Financial Information - Additional Information (Details)	Dec. 31, 2017	Sep. 13, 2017	Apr. 17, 2017	Mar. 29, 2017	Dec. 31, 2015
7% Senior Notes
Condensed Financial Statements Captions [Line Items]
Interest rate (as a percent)	7.00%				7.00%
6% Senior Notes
Condensed Financial Statements Captions [Line Items]
Interest rate (as a percent)	6.00%	6.00%	6.00%	6.00%