Debt (Senior Notes and Senior Secured Notes) (Details)	1 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Mar. 31, 2019
Non-Call Period
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)		100.00%
After Non-call Period
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)		100.00%
After Non-call Period | Minimum
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)		100.00%
After Non-call Period | Maximum
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)		107.125%
As of June 30, 2020 | Minimum
Debt Instrument, Redemption [Line Items]
Percentage of principal that may be redeemed		35.00%
As of June 30, 2020 | Maximum
Debt Instrument, Redemption [Line Items]
Percentage of principal that may be redeemed		40.00%
7.50% Senior Secured Notes due 2027
Debt Instrument, Redemption [Line Items]
Interest rate	7.50%	7.50%	7.50%
7.50% Senior Secured Notes due 2027 | Non-Call Period
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)	100.00%
Interest rate	7.50%	7.50%
7.50% Senior Secured Notes due 2027 | Non-Call Period | Maximum
Debt Instrument, Redemption [Line Items]
Percentage of principal that may be redeemed	35.00%
7.50% Senior Secured Notes due 2027 | After Non-call Period
Debt Instrument, Redemption [Line Items]
Interest rate	7.50%	7.50%
7.50% Senior Secured Notes due 2027 | After Non-call Period | Minimum
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)	100.00%
7.50% Senior Secured Notes due 2027 | After Non-call Period | Maximum
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)	105.625%
7.50% Senior Secured Notes due 2027 | As of June 30, 2020
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)		107.50%
9.50% Senior Secured Second Lien Notes due 2027
Debt Instrument, Redemption [Line Items]
Interest rate	9.50%	9.50%
9.50% Senior Secured Second Lien Notes due 2027 | Non-Call Period
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)	100.00%
Interest rate	9.50%	9.50%
9.50% Senior Secured Second Lien Notes due 2027 | Non-Call Period | Maximum
Debt Instrument, Redemption [Line Items]
Percentage of principal that may be redeemed	40.00%
9.50% Senior Secured Second Lien Notes due 2027 | After Non-call Period
Debt Instrument, Redemption [Line Items]
Interest rate	9.50%	9.50%
9.50% Senior Secured Second Lien Notes due 2027 | After Non-call Period | Minimum
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)	100.00%
9.50% Senior Secured Second Lien Notes due 2027 | After Non-call Period | Maximum
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)	107.125%
9.50% Senior Secured Second Lien Notes due 2027 | As of June 30, 2020
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)		109.50%
6.00% Senior Notes due 2028
Debt Instrument, Redemption [Line Items]
Interest rate	6.00%	6.00%
6.00% Senior Notes due 2028 | Non-Call Period
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)	100.00%
Interest rate	6.00%	6.00%
Percentage of principal that may be redeemed	106.00%
6.00% Senior Notes due 2028 | Non-Call Period | Maximum
Debt Instrument, Redemption [Line Items]
Percentage of principal that may be redeemed	40.00%
6.00% Senior Notes due 2028 | After Non-call Period
Debt Instrument, Redemption [Line Items]
Interest rate	6.00%	6.00%
6.00% Senior Notes due 2028 | After Non-call Period | Minimum
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)	100.00%
6.00% Senior Notes due 2028 | After Non-call Period | Maximum
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)	104.50%
6.00% Senior Notes due 2028 | As of June 30, 2020
Debt Instrument, Redemption [Line Items]
Redemption price (as percent)		106.00%