Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Earnings (Loss)	$ 68,377	$ 42,650	$ (211,628)	$ 98,728
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	331	618	(1,423)	1,042
Total Other Comprehensive Income (Loss)	331	618	(1,423)	1,042
Comprehensive Income (Loss)	$ 68,708	$ 43,268	$ (213,051)	$ 99,770