Other Non-Operating Income (Expense) (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Non-Operating (Expense) Income [Line Items]
Gain on sale of property, plant and equipment			$ 34,100		$ 21,400				$ 34,072	$ 21,379	$ 127,670
Foreign currency losses, net									(39,890)	(15,564)	(11,129)
Losses on sales or write-downs of cost method investments, net									28,571	1,124	(94)
Net losses on sales of businesses							$ 2,900		18,931	(23,335)	0
Gain on formation of a joint venture									3,232	5,972	0
Gain on sale of Classified Ventures									0	4,827	396,553
Gain on Berkshire marketable equity securities exchange									0	0	266,733
Net losses on sales or write-down of marketable equity securities									(1,791)	(14)	(3,044)
Other, net									1,375	(764)	1,321
Other (expense) income, net	$ (28,513)	$ (18,225)	$ 19,000	$ 15,096	$ 21,262	$ (40,458)	$ 11,678	$ (1,105)	(12,642)	(8,623)	778,010
Classified Ventures LLC [Member]
Schedule of Non-Operating (Expense) Income [Line Items]
Gain on sale of Classified Ventures									$ 0	$ 4,827	$ 396,553