Stockholders' Equity Accumulated Other comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	$ (2,865)	$ (6,267)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	7,337	4,838
Amounts reclassified from accumulated other comprehensive income/(loss)	(3,169)	(1,436)
Net current-period other comprehensive income/(loss)	4,168	3,402
Accumulated other comprehensive loss at end of period	1,303	(2,865)
AOCI Changes For Defined Benefit Pension And Postretirement Plans [Member]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	(5,146)	(4,933)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	262	(578)
Amounts reclassified from accumulated other comprehensive income/(loss)	1,616	365
Net current-period other comprehensive income/(loss)	1,878	(213)
Accumulated other comprehensive loss at end of period	(3,268)	(5,146)
Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	2,309	(1,334)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	7,075	5,400
Amounts reclassified from accumulated other comprehensive income/(loss)	(4,813)	(1,757)
Net current-period other comprehensive income/(loss)	2,262	3,643
Accumulated other comprehensive loss at end of period	4,571	2,309
Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	(28)	0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	16
Amounts reclassified from accumulated other comprehensive income/(loss)	28	(44)
Net current-period other comprehensive income/(loss)	28	(28)
Accumulated other comprehensive loss at end of period	$ 0	$ (28)