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Changes in Operations Australia - Arrium (Details)
$ in Thousands, AUD in Millions
3 Months Ended 6 Months Ended 12 Months Ended 48 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2017
AUD
Dec. 31, 2017
USD ($)
Dec. 31, 2014
USD ($)
Operating revenues $ 540,433 $ 501,375   $ 1,059,541 $ 983,991      
Australian Operations [Member]                
Asset Impairment Charges     $ 13,000          
Operating revenues $ 76,809 $ 55,283   $ 150,716 $ 107,081      
Arrium Limited [Member]                
Amount invested in capital project               $ 78,000
Arrium Limited [Member] | Scenario, Forecast [Member]                
Operating revenues           AUD 40 $ 31,000  
Arrium Limited [Member] | Australian Operations [Member]                
Provision for Doubtful Accounts     $ 8,100