Earnings (Loss) Per Share - Schedule of Potential Dilution (Details) - USD ($) $ / shares in Units, $ 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
Earnings Per Share [Abstract]
Potentially dilutive shares excluded (in shares)	105,235				123,450
Numerator:
Net Income (Loss)	$ (106,904)	$ (144,372)	$ 57,833	$ 36,358	$ (251,276)	$ 94,191
Denominator:
Weighted average common stock shares outstanding - Basic (in shares)	45,971,000		47,854,000		45,969,000	48,122,000
Assumed exercise of stock options and awards (in shares)	0		35,000		0	36,000
Weighted average common stock shares outstanding - Diluted (in shares)	45,971,000		47,889,000		45,969,000	48,158,000
Net Income (Loss) Per Share
Basic (in dollars per share)	$ (2.33)		$ 1.21		$ (5.47)	$ 1.96
Diluted (in dollars per share)	$ (2.33)		$ 1.21		$ (5.47)	$ 1.96