Summary of Significant Accounting Policies - Equity-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 23,300
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)	82,900,000
Common Stock [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Restricted share awards (shares)	4,000,000.0
Cumulative Restricted share awards forfeited (shares)	(3,700,000)
Cumulative Restricted Stock Units (shares)	6,600,000
Cumulative Restricted Stock Units forfeited (shares)	(1,800,000)
Cumulative Deferred Stock Units (shares)	500,000
Cumulative Stock Options (shares)	5,500,000
Cumulative stock options forfeited (shares)	100,000
Shares issued in period (shares)	16,600,000
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
General and Administrative Expense [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 2,872	$ 2,932
General and Administrative Expense [Member] \| Restricted Stock [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	77	160
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	1,249	1,426
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	1,229	1,211
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	72	59
General and Administrative Expense [Member] \| Employee Stock Option [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 245	$ 76

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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