Earnings per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net loss	$ (112,488)	$ (71,756)	$ (4,981)	$ (21,806)	$ (184,244)	$ (26,787)
Denominator:
Basic weighted-average common shares outstanding (in shares)	213,760		104,837		213,301	104,631
Diluted weighted-average common shares outstanding (in shares)	214,843		105,208		215,021	105,151
Restricted stock awards
Denominator:
Dilutive effect of awards granted (in shares)	147		29		134	35
Restricted stock units
Denominator:
Dilutive effect of awards granted (in shares)	0		15		727	158
Restricted stock performance-based unit awards
Denominator:
Dilutive effect of awards granted (in shares)	936		327		859	327