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Summary of Significant Accounting Policies - Equity-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 21,900		$ 21,900
Weighted-average remaining term (years)			2 years 6 months
Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance (shares)	95,100,000		95,100,000
Common Stock [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (shares)			18,000,000.0
Cumulative Restricted share awards (shares)	4,000,000.0		4,000,000.0
Cumulative Restricted share awards forfeited (shares)	(3,700,000)		(3,700,000)
Cumulative Restricted Stock Units (shares)	7,900,000		7,900,000
Cumulative Restricted Stock Units forfeited (shares)	(2,000,000.0)		(2,000,000.0)
Cumulative Deferred Stock Units (shares)	800,000		800,000
Cumulative Stock Options (shares)	5,300,000		5,300,000
Cumulative stock options forfeited (shares)	(300,000)		(300,000)
Common Stock [Member] \| Non-Executive Director Restricted Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (shares)			45,000
Shares available for future issuance (shares)	99,000		99,000
General and Administrative Expense [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 4,071	$ 3,883	$ 6,926	$ 6,755
General and Administrative Expense [Member] \| Restricted Stock [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	0	0	0	77
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	1,397	1,234	2,782	2,484
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	1,401	1,383	2,500	2,612
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	947	947	1,019	1,018
General and Administrative Expense [Member] \| Stock Options [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 326	$ 319	$ 625	$ 564