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Summary of Significant Accounting Policies - Equity-based Compensation (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 03, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 21,200		$ 21,200
Weighted-average remaining term (years)				2 years 3 months 18 days
Common Stock [Member] \| Equity Plan [Member] \| Fiscal Year 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (shares)	4,000,000			300,000
Cumulative Restricted share awards (shares)	800,000
Cumulative Restricted share awards forfeited (shares)	700,000
Cumulative Restricted Stock Units (shares)	1,900,000
Cumulative Restricted Stock Units forfeited (shares)	400,000
Cumulative Deferred Stock Units (shares)	200,000
Cumulative Stock Options (shares)	1,100,000
Cumulative Stock Options forfeited (shares)	100,000
Common Stock [Member] \| Equity Plan [Member] \| Fiscal Year 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (shares)				9,100,000
Cumulative Deferred Stock Units (shares)		1,173		1,173
Common Stock [Member] \| Non-Executive Director Restricted Share Plan [Member] \| Fiscal Year 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (shares)	9,000
General and Administrative Expense [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 3,188	$ 3,211	$ 10,217	$ 10,137
General and Administrative Expense [Member] \| Time-Based Restricted Stock Units [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		1,537	1,412	4,480	4,195
General and Administrative Expense [Member] \| Long Term Incentive Target Awards [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		1,455	1,416	4,009	3,916
General and Administrative Expense [Member] \| Deferred Stock Units [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		27	53	1,138	1,071
General and Administrative Expense [Member] \| Stock Options [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 169	$ 330	$ 590	$ 955