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Related Party Transactions (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Related Party Transaction [Line Items]        
Revenues $ 1,380,361 $ 1,340,809 $ 3,002,406 $ 3,029,680
Gross profit 58,812 52,204 97,728 77,782
Income from continuing operations 16,328 556 11,518 (17,568)
Net income 13,421 (2,051) 7,248 (20,164)
Net income attributable to companies $ 13,714 $ (1,410) $ 7,972 $ (19,122)