Consolidated Statements of Cash Flows Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]
Interest	$ 33,952	$ 57,269	$ 67,974
Income taxes	373,900	276,789	133,283
Supplemental schedule of non-cash investing and financing activities:
Additions to property, plant and equipment	30,643	0	0
Fair value of net assets acquired in acquisition	369,956	0	1,564,970
Noncontrolling interest of assets acquired	0	0	(24,160)
Liabilities assumed in acquisition	(119,157)	0	(17,147)
Shares issued for acquisitions	0	0	(153,096)
Noncash investing and financing activities, total	$ 250,799	$ 0	$ 1,370,567