Income Taxes Table 2 (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of the federal statutory and effective income tax rate
U.S. Federal statutory rate	21.00%	35.00%	35.00%
State and local income taxes, net of federal tax effect	0.10%	2.30%	(0.40%)
Effect of excess of percentage depletion over cost depletion	(17.80%)	(10.00%)	(10.60%)
Manufacturing production deduction, including impact of NOL carryback	6.30%	(0.80%)	(3.30%)
Foreign Derived Intangible Income Tax Deduction	(2.90%)	0.00%	0.00%
Tax Cuts and Jobs Act Impact	(67.80%)	47.10%	0.00%
Foreign Rate Differential	1.50%	(3.40%)	(5.90%)
Research and developmental tax credit	(7.60%)	(2.60%)	(6.60%)
Foreign Tax Credit	(1.90%)	(1.10%)	(28.10%)
Foreign Repatriation	2.00%	1.30%	13.70%
Incremental fixed asset basis	(0.00%)	(3.40%)	(0.00%)
Adjustment to unrecognized tax benefits	2.70%	2.80%	3.20%
Stock Compensation - excess tax benefits	(4.40%)	(1.90%)	(0.00%)
Valuation allowance	38.70%	2.40%	0.10%
Other items	2.50%	0.80%	1.20%
Effective tax rate	(27.60%)	68.50%	(1.70%)