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Notes Payable (Credit Facility) (Details) - Credit Facility
6 Months Ended 12 Months Ended
Jan. 03, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 500,000,000
Minimum shareholders' equity     $ 1,000,000,000.0
New Credit Facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 1,000,000,000    
Additional borrowing capacity $ 500,000,000    
Remaining borrowing capacity   $ 998,000,000  
Current borrowing capacity   1,000,000,000  
Letters of credit outstanding   2,000,000  
New Credit Facility | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Line of credit outstanding   $ 0  
LIBOR | New Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent)   1.05%  
Federal Funds Rate      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent)     0.50%
Federal Funds Rate | New Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent) 0.50%    
One-month LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent)     1.00%
One-month LIBOR | New Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent) 1.00%    
Minimum      
Line of Credit Facility [Line Items]      
Unencumbered interest coverage ratio     2.0
Fixed charge coverage ratio     1.50
Annual facility fee (percent)     0.15%
Minimum | New Credit Facility      
Line of Credit Facility [Line Items]      
Unencumbered interest coverage ratio 1.75    
Minimum | LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent) 1.05%   1.10%
Minimum | Base Rate      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent) 0.10%   0.10%
Maximum      
Line of Credit Facility [Line Items]      
Leverage ratio (percent)     60.00%
Annual facility fee (percent)     0.30%
Maximum | LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent) 1.45%   1.45%
Maximum | Base Rate      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent) 0.45%   0.45%