Supplemental Guarantor Condensed Consolidated Financial Statements - Additional Information (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2020	Jun. 23, 2017
Condensed Consolidated financial statements [Line Items]
Interest owned by the holding company	100.00%
Secured Debt [Member] \| 6.75% Senior Secured Notes [Member]
Condensed Consolidated financial statements [Line Items]
Debt Instrument, Face Amount		$ 200.0

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

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant