Share-Based Compensation - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock
Unvested restricted stock
Outstanding at the beginning of the period (in shares))	3,612,000
Granted (in shares)	3,265,000
Vested (in shares)	(1,444,000)
Outstanding at the end of the period (in shares)	4,912,000	3,612,000
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 9.16
Granted (in dollars per share)	3.26
Vested (in dollars per share)	9.66
Outstanding at the end of the period (in dollars per share)	$ 5.42	$ 9.16
Total future compensation cost related to unvested awards that are expected to vest	$ 17.9
Weighted Average Period for Cost recognition	2 years
Restricted Stock \| Employees and Director
Unvested restricted stock
Granted (in shares)	3,264,925	2,392,486	1,130,304
Restricted Stock Based on Performance Conditions
Unvested restricted stock
Outstanding at the beginning of the period (in shares))	1,746,000
Granted (in shares)	2,413,000
Vested (in shares)	(919,000)
Outstanding at the end of the period (in shares)	3,240,000	1,746,000
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 9.35
Granted (in dollars per share)	3.10
Vested (in dollars per share)	10.15
Outstanding at the end of the period (in dollars per share)	$ 4.47	$ 9.35
Total future compensation cost related to unvested awards that are expected to vest	$ 4.2
Restricted Stock Based on Performance Conditions \| Executive Officer
Unvested restricted stock
Granted (in shares)	2,412,631	1,009,948	461,919
Restricted Stock Based on Market Conditions
Unvested restricted stock
Outstanding at the beginning of the period (in shares))	1,357,000
Granted (in shares)	2,609,561	1,058,158	397,692
Vested (in shares)	(188,000)
Forfeited (in shares)	(562,000)
Outstanding at the end of the period (in shares)	3,217,000	1,357,000
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 7.09
Granted (in dollars per share)	1.42
Vested (in dollars per share)	5.58
Forfeited (in dollars per share)	5.58
Outstanding at the end of the period (in dollars per share)	$ 2.84	$ 7.09

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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