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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Examination [Line Items]      
Estimated reduction in deferred tax liabilities $ (4,300,000)    
Income tax payable 2,833,000 $ 0  
Decrease in net deferred tax liability related to acquisitions of non-controlling interests (1,200,000)    
Charge to current year provision for income taxes 300,000    
Offset to adjustment, reduction in the previously reported tax receivable   1,700,000  
Reduction of the income tax provision 1,300,000 1,000,000  
Increase in current state income tax provision 312,000 34,000 $ 147,000
Accrued interest and penalties associated with any unrecognized tax benefits 0 0 0
Interest expense recognized 0 0 $ 0
Federal [Member]      
Income Tax Examination [Line Items]      
Income tax payable $ 2,800,000    
Offset to adjustment, reduction in the previously reported tax receivable   1,100,000  
Tax receivable included in other current assets   700,000  
Federal [Member] | Minimum [Member]      
Income Tax Examination [Line Items]      
Periods open for examination 2014    
Federal [Member] | Maximum [Member]      
Income Tax Examination [Line Items]      
Periods open for examination 2016    
State [Member]      
Income Tax Examination [Line Items]      
Offset to adjustment, reduction in the previously reported tax receivable   600,000  
Tax receivable included in other current assets $ 2,200,000 $ 1,500,000  
State [Member] | Minimum [Member]      
Income Tax Examination [Line Items]      
Periods open for examination 2013    
State [Member] | Maximum [Member]      
Income Tax Examination [Line Items]      
Periods open for examination 2016