Common Stock and Earnings per Share - Schedule of Antidilutive Shares Excluded from Computation of Diluted Earnings per Share (Details) - shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares Underlying Stock Options Excluded
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from diluted earnings per share (shares)	1,996	622	1,175
Performance Stock Grants Excluded because Performance Conditions Have Not Been Met
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from diluted earnings per share (shares)	578	717	752

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration