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Condensed Consolidated Statements of Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Revenues, Net From Related Parties $ 1,515 $ 1,450 $ 4,594 $ 14,356
Related Party Transaction, Selling, General and Administrative Expenses $ 216 $ 647 $ 1,205 $ 2,537