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Summary Of Major Accounting Policies - Acquisitions (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Business Acquisition [Line Items]          
Business Acquisitions, net of cash acquired   $ (68,000)      
Business Acquisition, Percentage of Voting Interests Acquired 60.00%        
Stockholders' Equity Attributable to Noncontrolling Interest   6,063 $ 5,354    
Payments to Acquire Businesses, Net of Cash Acquired $ (12,400) $ 68,571 $ 11,278 $ 30,121  
Variable Interest Entity, Not Primary Beneficiary [Member]          
Business Acquisition [Line Items]          
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 49.00%        
Subsidiaries [Member]          
Business Acquisition [Line Items]          
Advances to Affiliate         $ 6,400