Income Taxes - Deferred Tax Balances (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Retirement benefits	$ 15,142,000	$ 8,185,000
Allowance for doubtful accounts	2,253,000	1,160,000
Insurance and litigation reserves	1,002,000	357,000
Performance incentives	7,213,000	4,364,000
Equity-based compensation	1,050,000	753,000
Prepaid expense	2,976,000	(6,000)
Insurance settlement	3,895,000	3,962,000
Operating loss carryforward	16,044,000	8,434,000
Foreign tax credit and other credits	34,384,000	0
Interest	11,479,000	614,000
Restructuring reserves	2,167,000
Restructuring reserves		(802,000)
Right of use lease assets	10,015,000	0
Royalties and license fees	2,156,000	325,000
Inventory reserves	2,163,000	841,000
Research and development	2,580,000
Research and development		(5,000)
Other	1,317,000	489,000
Total deferred tax assets, gross	115,836,000	28,671,000
Valuation allowance	(13,834,000)	(7,520,000)
Total deferred tax assets, net	102,002,000	21,151,000
Depreciation	17,754,000	4,098,000
Foreign pension and other	1,269,000	1,062,000
Amortization and other	254,359,000	11,191,000
Lease liabilities	9,965,000	0
Outside basis in equity investment	6,776,000	0
Unremitted earnings	8,228,000	7,857,000
Total deferred tax liabilities	$ 298,351,000	$ 24,208,000