Supplemental Guarantor Information (Narrative) (Details)	12 Months Ended
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Subsidiary ownership	100.00%
Unsecured Senior Notes Due 2024 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate on unsecured senior notes	7.75%

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=120391452&loc=d3e13212-122682

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