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Intangible Assets (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 02, 2017
Oct. 14, 2015
Dec. 31, 2017
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]        
Investment capacity under Clinton's management $ 1,000,000,000      
Stock issued (in shares) 1,250,000      
Fair value of stock issued $ 10,100,000      
Intangible assets impairment charges     $ 2,700,000 $ 2,700,000
Capacity Agreement        
Acquired Finite-Lived Intangible Assets [Line Items]        
Intangible assets useful life (in years) 5 years      
Intangible assets impairment charges       $ 0
CDI        
Acquired Finite-Lived Intangible Assets [Line Items]        
Percentage of voting interest acquired   100.00%    
Consideration transferred   $ 6,700,000    
Intangible assets acquired   $ 4,300,000