Contingencies (Schedule of Changes in Claims) (Details) - Asbestos Litigation [Member] $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) claims	Dec. 31, 2016 USD ($) claims	Dec. 31, 2015 USD ($) claims	Dec. 31, 2014 USD ($) claims	Dec. 31, 2013 USD ($) claims	Dec. 31, 2012 USD ($) claims	Dec. 31, 2011 USD ($) claims	Dec. 31, 2010 USD ($) claims	Dec. 31, 2009 USD ($) claims	Dec. 31, 2008 USD ($) claims	Dec. 31, 2007 USD ($) claims	Dec. 31, 2006 USD ($) claims
Loss Contingencies [Line Items]
Opening Number of Claims	3,745	3,791	3,821	4,299	4,463	4,446	5,170	8,945	18,385	18,798	19,416	24,451
Claims Dismissed, Settled, or Resolved	13	148	116	625	230	90	789	3,963	9,482	523	808	6,841
New Claims	20	102	86	147	66	107	65	188	42	110	190	1,806
Closing Number of Claims	3,752	3,745	3,791	3,821	4,299	4,463	4,446	5,170	8,945	18,385	18,798	19,416
Amounts Paid (thousands) to Settle or Resolve ($) | $	$ 10	$ 758	$ 164	$ 437	$ 78	$ 530	$ 1,111	$ 159	$ 88	$ 52	$ 15	$ 3,879
Brandon Drying Fabrics, Inc. [Member]
Loss Contingencies [Line Items]
Opening Number of Claims	7,706	7,713	7,730	7,815	7,867	7,877	7,869	7,907	8,664	8,740	9,114	9,566
Claims Dismissed, Settled, or Resolved		7	18	87	55	12	3	47	760	86	462	1,182
New Claims			1	2	3	2	11	9	3	10	88	730
Closing Number of Claims	7,706	7,706	7,713	7,730	7,815	7,867	7,877	7,869	7,907	8,664	8,740	9,114
Amounts Paid (thousands) to Settle or Resolve ($) | $