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Notes Payable - Additional Information (Details)
6 Months Ended
Aug. 01, 2019
USD ($)
Jun. 30, 2019
Aug. 01, 2019
GBP (£)
Mar. 30, 2016
USD ($)
Debt Instrument [Line Items]        
Minimum Repayment of Aggregate Principal Amount of Senior Notes (as a percent)   5.00%    
Outstanding Principal Amount of Senior Notes (as a percent)   100.00%    
Parent Company [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross       $ 170,000,000
Parent Company [Member] | Series A Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross       $ 38,000,000
Debt Instrument, Interest Rate, Stated Percentage       4.88%
Parent Company [Member] | Series B Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross       $ 67,000,000
Debt Instrument, Interest Rate, Stated Percentage       5.23%
Parent Company [Member] | Series C Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross       $ 48,000,000
Debt Instrument, Interest Rate, Stated Percentage       5.48%
Parent Company [Member] | Series D Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross       $ 17,000,000
Debt Instrument, Interest Rate, Stated Percentage       5.58%
Subsequent Event [Member]        
Debt Instrument [Line Items]        
Minimum Repayment of Aggregate Principal Amount of Senior Notes (as a percent) 5.00%      
Outstanding Principal Amount of Senior Notes (as a percent) 100.00%      
Subsequent Event [Member] | Parent Company [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Weighted Average Life 12 years      
Long-term Debt, Weighted Average Interest Rate, at Point in Time 4.26%   4.26%  
Subsequent Event [Member] | Parent Company [Member] | Series E Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 75,000,000      
Debt Instrument, Interest Rate, Stated Percentage 4.34%   4.34%  
Subsequent Event [Member] | Parent Company [Member] | Series F Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 60,000,000      
Debt Instrument, Interest Rate, Stated Percentage 4.44%   4.44%  
Subsequent Event [Member] | Parent Company [Member] | Series G Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 40,000,000      
Debt Instrument, Interest Rate, Stated Percentage 4.54%   4.54%  
Subsequent Event [Member] | Parent Company [Member] | Series H Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross | £     £ 25,000,000  
Debt Instrument, Interest Rate, Stated Percentage 3.33%   3.33%  
United States of America, Dollars | Subsequent Event [Member] | Parent Company [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 175,000,000      
United Kingdom, Pounds | Subsequent Event [Member] | Parent Company [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross | £     £ 25,000,000