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Summary of Significant Accounting Policies - Equity-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 20,300		$ 20,300
Weighted-average remaining term (years)			2 years 3 months 18 days
Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance (shares)	88,200,000		88,200,000
Common Stock [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (shares)			16,600,000
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)	6,600,000		6,600,000
Cumulative Restricted Stock Units forfeited (shares)	(1,800,000)		(1,800,000)
Cumulative Deferred Stock Units (shares)	600,000		600,000
Cumulative Stock Options (shares)	5,400,000		5,400,000
Cumulative stock options forfeited (shares)	200,000		200,000
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	$ 3,883	$ 4,005	$ 6,755	$ 6,880
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	157	77	317
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	1,234	1,233	2,484	2,602
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	1,383	1,485	2,612	2,697
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	957	1,018	1,015
General and Administrative Expense [Member] \| Share-based Payment Arrangement, Option [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 319	$ 173	$ 564	$ 249