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Notes Receivable (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Payments to Acquire Businesses, Gross $ 37,112 $ 37,112    
Proceeds from Collection of Notes Receivable   $ 221 $ 249 $ 466