v3.5.0.2
Debt - Credit Agreement (Details) - USD ($)
 9 Months Ended
Apr. 01, 2016
Apr. 13, 2011
Sep. 30, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]        
Period of trailing quarters used in calculating leverage ratio     12 months  
Line of Credit | CRNF Credit Facility | Eurodollar        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   3.50%    
Line of Credit | CRNF Credit Facility | Eurodollar | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   3.50%    
Line of Credit | CRNF Credit Facility | Eurodollar | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   4.25%    
Line of Credit | CRNF Credit Facility | Base Rate | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   2.50%    
Line of Credit | CRNF Credit Facility | Base Rate | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   3.25%    
Line of Credit | CRNF Credit Facility | Prime        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   2.50%    
Line of Credit | Term Loan | CRNF Credit Facility        
Line of Credit Facility [Line Items]        
Debt instrument face amount   $ 125,000,000    
Interest paid $ 300,000      
Line of Credit | Revolving credit facility | CRNF Credit Facility        
Line of Credit Facility [Line Items]        
Borrowing capacity   25,000,000    
Uncommitted incremental facility   $ 50,000,000    
Amount outstanding under revolving credit facility       $ 0
Effective rate (as a percent)       4.60%