Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current year activity:
Accumulated other comprehensive income (loss), net of tax, beginning balance	$ (38,639)	$ (45,462)	$ (58,234)
Other comprehensive income (loss) before reclassifications	2,728	3,584	7,696
Amounts reclassified from accumulated other comprehensive income	(2,682)	2,560	9,812
Other comprehensive income (loss) before tax	46	6,144	17,508
Deferred taxes on current period activity	1,576	(679)	4,736
Other comprehensive income (loss) after tax	(1,530)	6,823	12,772
Accumulated other comprehensive income (loss), net of tax, ending balance	(40,169)	(38,639)	(45,462)
Gains and Losses On Cash Flow Hedges
Current year activity:
Accumulated other comprehensive income (loss), net of tax, beginning balance	817	897	901
Other comprehensive income (loss) before reclassifications	5,204	(2,725)	(968)
Amounts reclassified from accumulated other comprehensive income	(3,119)	2,617	959
Other comprehensive income (loss) before tax	2,085	(108)	(9)
Deferred taxes on current period activity	482	(28)	(5)
Other comprehensive income (loss) after tax	1,603	(80)	(4)
Accumulated other comprehensive income (loss), net of tax, ending balance	2,420	817	897
Pension and Post- Employment Benefits
Current year activity:
Accumulated other comprehensive income (loss), net of tax, beginning balance	(43,473)	(41,346)	(54,543)
Other comprehensive income (loss) before reclassifications	4,428	(2,721)	9,085
Amounts reclassified from accumulated other comprehensive income	437	(57)	8,853
Other comprehensive income (loss) before tax	4,865	(2,778)	17,938
Deferred taxes on current period activity	1,094	(651)	4,741
Other comprehensive income (loss) after tax	3,771	(2,127)	13,197
Accumulated other comprehensive income (loss), net of tax, ending balance	(39,702)	(43,473)	(41,346)
Foreign Currency Translation
Current year activity:
Accumulated other comprehensive income (loss), net of tax, beginning balance	4,017	(5,013)	(4,592)
Other comprehensive income (loss) before reclassifications	(6,904)	9,030	(421)
Amounts reclassified from accumulated other comprehensive income	0	0	0
Other comprehensive income (loss) before tax	(6,904)	9,030	(421)
Deferred taxes on current period activity	0	0	0
Other comprehensive income (loss) after tax	(6,904)	9,030	(421)
Accumulated other comprehensive income (loss), net of tax, ending balance	(2,887)	4,017	(5,013)
Foreign Currency | Gains and Losses On Cash Flow Hedges
Current year activity:
Accumulated other comprehensive income (loss), net of tax, beginning balance	519	1,324	1,263
Other comprehensive income (loss) before reclassifications	2,252	(1,268)	108
Amounts reclassified from accumulated other comprehensive income	123	222	(29)
Other comprehensive income (loss) before tax	2,375	(1,046)	79
Deferred taxes on current period activity	546	(241)	18
Other comprehensive income (loss) after tax	1,829	(805)	61
Accumulated other comprehensive income (loss), net of tax, ending balance	2,348	519	1,324
Precious Metals | Gains and Losses On Cash Flow Hedges
Current year activity:
Accumulated other comprehensive income (loss), net of tax, beginning balance	(170)	(452)	79
Other comprehensive income (loss) before reclassifications	508	(1,675)	(1,285)
Amounts reclassified from accumulated other comprehensive income	(193)	2,041	595
Other comprehensive income (loss) before tax	315	366	(690)
Deferred taxes on current period activity	73	84	(159)
Other comprehensive income (loss) after tax	242	282	(531)
Accumulated other comprehensive income (loss), net of tax, ending balance	72	(170)	(452)
Copper | Gains and Losses On Cash Flow Hedges
Current year activity:
Accumulated other comprehensive income (loss), net of tax, beginning balance	468	25	(441)
Other comprehensive income (loss) before reclassifications	2,444	218	209
Amounts reclassified from accumulated other comprehensive income	(3,049)	354	393
Other comprehensive income (loss) before tax	(605)	572	602
Deferred taxes on current period activity	(137)	129	136
Other comprehensive income (loss) after tax	(468)	443	466
Accumulated other comprehensive income (loss), net of tax, ending balance	$ 0	$ 468	$ 25