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New Accounting Standards (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Deferred tax asset, current $ 64,950 $ 89,177    
Goodwill impairment charge 77,343      
Goodwill 4,529,645 4,390,261 $ 1,424,591 $ 1,422,825
Accounting Standards Update 2016 09 [Member]        
Excess tax benefits associated with equity-based compensation 6,719      
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