Background, Organization, and Summary of Significant Accounting Policies Background, Organization, and Summary of Significant Accounting Policies - Schedule of Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Weighted average basic shares (in shares)	56,271	54,670	55,683	53,996	55,508	53,219
Effect of dilutive securities:
Management Incentive Plan shares (in shares)	0	12	0	11	3	15
Restricted stock units (in shares)	86	66	70	56	66	53
Weighted average diluted shares (in shares)	56,357	54,748	55,753	54,063	55,577	53,287
Number of performance share units granted (in shares)	76	55	63	48	57	44