Other Results of Operations Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Nonoperating Income (Expense) [Abstract]
Manufacturing revenues	$ 412,826	$ 391,920	$ 379,274
Income (loss) from managed funds	(69,038)	(37,237)	12,251
Asset management fees	29,492	34,777	27,990
Dividend income	3,856	5,482	7,379
Income from associated companies classified as other revenues	17,184	75,717	90,242
Revenues of oil and gas exploration and development businesses	49,890	45,939	19,373
Gain on sale of equity interest	0	0	22,714
Other	43,976	32,630	11,242
Total other income	488,186	549,228	570,465
Taxes other than income or payroll	35,400	21,900	17,000
Advertising costs	$ 20,000	$ 18,100	$ 14,500