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

Long-term Debt - 5.625% Senior Unsecured Notes and Covenants (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2017	Jan. 19, 2017
Debt Instrument [Line Items]
Interest rate	5.625%
Senior notes \| 5.875% senior subordinated notes due 2021
Debt Instrument [Line Items]
Interest rate		5.875%
Senior notes \| 5.625% Notes due 2027
Debt Instrument [Line Items]
Debt principal amount			$ 400,000,000.0
Interest rate	5.625%		5.625%