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Debt Obligations - Summary (Details) - USD ($)
9 Months Ended
Oct. 01, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Obligations        
Applicable Interest Rate (as a percent)   4.22%    
Borrowings   $ 73,400,000 $ 96,500,000  
Outstanding Balance   683,869,000   $ 645,029,000
Available for borrowing   542,100,000   581,833,000
Principal payments on senior unsecured notes   $ 14,667,000 $ 20,166,000  
Bank Borrowings        
Debt Obligations        
Applicable Interest Rate (as a percent)   3.39%    
Outstanding Balance   $ 165,400,000   112,000,000
Available for borrowing   $ 434,600,000   488,000,000
Bank Borrowings | Subsequent Event        
Debt Obligations        
Outstanding Balance $ 65,400,000      
Available for borrowing 534,600,000      
Senior Unsecured Notes        
Debt Obligations        
Applicable Interest Rate (as a percent)   4.48%    
Outstanding Balance   $ 518,469,000   533,029,000
Available for borrowing   $ 107,500,000   $ 93,833,000
Senior Unsecured Notes | Subsequent Event        
Debt Obligations        
Outstanding Balance 618,469,000      
Available for borrowing 7,500,000      
$100,000 unsecured notes | Subsequent Event        
Debt Obligations        
Mezzanine loan principal amount $ 100,000,000      
Interest rate (as a percent) 3.85%      
$100,000 unsecured notes | Bank Borrowings | Subsequent Event        
Debt Obligations        
Borrowings $ 100,000,000      
Mezzanine loan principal amount $ 100,000,000