Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Schedule of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (14)	$ (12)	$ (14)	$ (12)	$ (14)	$ (14)	$ (12)	$ (12)
Accumulated other comprehensive income (loss), beginning balance	(75,860)	(60,366)	(78,656)	(61,866)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	1,811	972	5,433	2,916
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	0	0	0	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, before Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,398	750		2,250
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0	0
Accumulated other comprehensive income (loss), ending balance	(74,462)	(59,616)	(74,462)	(59,616)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	66,070	(4,841)	191,090	29,238
Other Comprehensive Income (Loss), Tax	$ (413)	(222)	$ (1,239)	(666)
Common stock, shares outstanding (in shares)	74,199,254		74,199,254			59,560,036
Stockholders' Equity Attributable to Parent	$ 1,182,836	714,620	$ 1,182,836	714,620	1,114,727	$ 855,497	496,533	460,342
Stock Issued During Period, Value, Restricted Stock Award, Gross	0	0	0	0
Withholdings of common shares, net of issuances	(5)	0	(1,241)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,044	1,835	5,523	5,786
NET EARNINGS (LOSS)	64,672	(5,591)	186,896	26,988
Stock Issued During Period, Value, Share-based Compensation, Withholdings of Common Shares, Net of Issuances				(1,839)
reclassification of liability to equity		221,093		221,093
Amazon Warrant AB and C
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, before Tax [Abstract]
reclassification of liability to equity		221,093		221,093
Accumulated Other Comprehensive Income (Loss) [Member]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, before Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			4,194
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			186,896
Stockholders' Equity Attributable to Parent	$ (74,462)	$ (59,616)	$ (74,462)	$ (59,616)	$ (75,860)	$ (78,656)	$ (60,366)	$ (61,866)
Common Stock [Member]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, before Tax [Abstract]
Common stock, shares outstanding (in shares)	74,199,254	59,589,770	74,199,254	59,589,770	74,202,815	59,560,036	59,589,770	59,329,431
Stockholders' Equity Attributable to Parent	$ 742	$ 596	$ 742	$ 596	$ 742	$ 596	$ 596	$ 593
Grant of restricted stock (in shares)	(761)	0	121,339	201,400
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ 0	$ 0	$ 1	$ 2
Issuance of common shares, net of withholdings (in shares)	0	0	92,234
Withholdings of common shares, net of issuances	$ 0	$ 0	$ 1
Withholdings of common shares, net of issuances (in shares)				59,439
Stock Issued During Period, Value, Share-based Compensation, Withholdings of Common Shares, Net of Issuances				$ 1
Additional Paid-in Capital [Member]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, before Tax [Abstract]
Stockholders' Equity Attributable to Parent	991,650	700,757	991,650	700,757	989,611	855,547	477,829	475,720
Stock Issued During Period, Value, Restricted Stock Award, Gross	0	0	(1)	(2)
Withholdings of common shares, net of issuances	(5)	0	(1,242)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,044	1,835	5,523	5,786
Stock Issued During Period, Value, Share-based Compensation, Withholdings of Common Shares, Net of Issuances				(1,840)
Accumulated Deficit [Member]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, before Tax [Abstract]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	64,672	(5,591)		26,988
Stockholders' Equity Attributable to Parent	264,906	72,883	264,906	72,883	$ 200,234	$ 78,010	$ 78,474	$ 45,895
Pension Plans [Member]
Schedule of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(75,369)	(59,700)	(78,093)	(61,152)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	1,764	941	5,292	2,823
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, before Tax [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(402)	(215)	(1,206)	(645)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	1,362	726	4,086	2,178
Accumulated other comprehensive income (loss), ending balance	(74,007)	(58,974)	(74,007)	(58,974)
Post-Retirement Plans [Member]
Schedule of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(477)	(654)	(549)	(702)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	47	31	141	93
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, before Tax [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(11)	(7)	(33)	(21)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	36	24	108	72
Accumulated other comprehensive income (loss), ending balance	$ (441)	$ (630)	$ (441)	$ (630)