Earnings (Loss) Per Share - Schedule of Potential Dilution (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Potentially dilutive shares excluded (in shares)	164,253						137,051
Numerator:
Net Income (Loss)	$ (97,099)	$ (106,904)	$ (144,372)	$ 80,076	$ 57,833	$ 36,358	$ (348,375)	$ 174,267
Denominator:
Weighted average common stock shares outstanding - basic (in shares)	46,001,000			47,119,000			45,980,000	47,784,000
Assumed exercise of stock options and awards (in shares)	0			117,000			0	63,000
Weighted average common stock shares outstanding - diluted (in shares)	46,001,000			47,236,000			45,980,000	47,847,000
Net Income (Loss) Per Share
Basic (in dollars per share)	$ (2.11)			$ 1.70			$ (7.58)	$ 3.65
Diluted (in dollars per share)	$ (2.11)			$ 1.70			$ (7.58)	$ 3.64