Reportable Segments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 211,999	$ 271,133	$ 673,753	$ 796,454
Gross profit	87,302	104,107	279,754	301,060
Revenue, remaining performance obligation, amount	81,000		81,000
Remaining performance obligation expected to be recognized during 2020			3,500	6,100
Revenue Benchmark [Member] | Product Concentration Risk [Member] | U.S. government contracts or programs [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage					25.00%
Albany Safran Composites, LLC [Member]
Segment Reporting Information [Line Items]
Operating lease, lease income			700
Net sales			73,600	175,200
Receivables, net, current	119,800		119,800		$ 114,500
Albany Engineered Composites [Member]
Segment Reporting Information [Line Items]
Net sales	73,252	119,809	244,971	345,781
Gross profit	$ 3,500	$ 3,200	$ 9,500	$ 8,800