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New Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Jan. 01, 2017	Sep. 30, 2016	Dec. 31, 2015
Sales incentives	$ 16,000
Deferred tax asset, current	82,876	$ 89,177
Goodwill impairment charge	77,343
Goodwill	4,688,348	4,390,261		$ 4,351,170	$ 1,422,825
Accounting Standards Update 2016 09 [Member]
Excess tax benefits associated with equity-based compensation	6,776
Cumulative effect adjustment to Retained Earnings	1,384
Exploration and Production [Member]
Goodwill impairment charge	77,343	0
Goodwill		$ 77,343	$ 77,343	$ 77,343	$ 77,343
Exploration and Production [Member] | Accounting Standards Update 2017 04 [Member]
Goodwill impairment charge	$ 77,343

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards classified as current.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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