Long-Term Incentive Compensation - Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Stock Options
Outstanding – December 31, 2019 (in shares)	636,000
Granted (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	(86,000)
Outstanding – September 30, 2020 (in shares)	550,000
Weighted average grant date fair value (2020 awards) (in dollars per share) | $ / shares	$ 0
Service-based Restricted Stock
Service-based and Performance-based Stock
Outstanding – December 31, 2019 (in shares)	1,064,000
Granted (in shares)	686,000
Vested (in shares)	(540,000)
Forfeited (in shares)	(55,000)
Outstanding – September 30, 2020 (in shares)	1,155,000
Weighted average grant date fair value (2020 awards) (in dollars per share) | $ / shares	$ 10.02
Performance-based Stock Units
Service-based and Performance-based Stock
Outstanding – December 31, 2019 (in shares)	248,000
Granted (in shares)	181,000
Vested (in shares)	(125,000)
Forfeited (in shares)	0
Outstanding – September 30, 2020 (in shares)	304,000
Weighted average grant date fair value (2020 awards) (in dollars per share) | $ / shares	$ 11.15