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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Examination [Abstract]      
Deferred tax assets, related to revaluation and acquisition of redeemable non-controlling interests $ 6,600    
Estimated reduction in deferred tax liabilities   $ (4,300)  
Income tax payable 0 2,833  
Adjustment to deferred tax assets 100    
Decrease in net deferred tax liability related to acquisitions of non-controlling interests   (1,200)  
Charge to current year provision for income taxes   300  
Offset to adjustment, reduction in the previously reported tax receivable   1,700  
Reduction of the income tax provision 500    
Increase (decrease) in state income tax provision (500) 312 $ 34
Accrued interest and penalties associated with any unrecognized tax benefits 0 0 0
Interest expense recognized 0 0 $ 0
Federal [Member]      
Income Tax Examination [Abstract]      
Income tax payable   2,800  
Offset to adjustment, reduction in the previously reported tax payable 1,200    
Tax receivable included in other current assets $ 900    
Periods open for examination 2015 2016 2017    
State [Member]      
Income Tax Examination [Abstract]      
Offset to adjustment, reduction in the previously reported tax receivable $ 800    
Tax receivable included in other current assets $ 1,300 $ 2,200  
Periods open for examination 2014 2015 2016 2017