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
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net Income (Loss)	$ (3,414)	$ 16,528	$ (5,035)	$ 14,393
Other Comprehensive Income (Loss), Net of Tax:
Amortization of actuarial losses	219	62	438	125
Total other comprehensive income, net of tax	219	62	438	125
Total Comprehensive Income (Loss)	$ (3,195)	$ 16,590	$ (4,597)	$ 14,518