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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE 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 income (loss)	$ 1,954	$ (89,737)	$ (23,535)	$ (134,231)
Other comprehensive income, net of income taxes:
Reclassification adjustment for losses on cash flow hedges included in net income	40	36	76	70
Change in unfunded pension plan obligation liability	46	337	92	674
Other	0	7	0	13
Comprehensive income (loss)	$ 2,040	$ (89,357)	$ (23,367)	$ (133,474)

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