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Note 16 - Lines of Credit and Total Debt Obligations (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 16, 2017
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 27, 2018
Dec. 26, 2018
Nov. 01, 2018
Oct. 31, 2018
Dec. 27, 2017
Dec. 26, 2017
Aug. 10, 2017
May 13, 2013
Jan. 10, 2013
Letters of Credit Outstanding, Amount   $ 90,500 $ 90,500                      
Payments of Financing Costs, Total     $ 3,026 $ 2,665                  
Senior Notes 6% Due January 2043, Issued on October 16, 2017 [Member]                            
Debt Instrument, Interest Rate, Stated Percentage 6.00%                          
Debt Instrument, Face Amount $ 150,000                          
Debt Instrument, Percentage of Face Value 97.00%                          
Proceeds from Issuance of Senior Long-term Debt, Net $ 146,500                          
Debt Instrument, Accrued Interest, Included in Proceeds 2,200                          
Payments of Financing Costs, Total 1,300                          
Senior Notes 6% Due January 2043 [Member]                            
Debt Instrument, Interest Rate, Stated Percentage   6.00% 6.00% 6.00%                    
Debt Instrument, Face Amount $ 500,000 $ 500,000 $ 500,000 $ 500,000                    
Senior Notes 6% Due January 2043, Issued on January 10, 2013 [Member]                            
Debt Instrument, Face Amount                           $ 250,000
Senior Notes 6% Due January 2043, Issued on May 13, 2013 [Member]                            
Debt Instrument, Face Amount                         $ 100,000  
Standby Letters of Credit [Member]                            
Letters of Credit Outstanding, Amount   $ 27,800 27,800 32,000                    
Maximum [Member] | Borrowing Base is Required [Member]                            
Line of Credit Facility, Leverage Ratio   55.00%                        
Revolving Credit Facility [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity               $ 1,000,000 $ 700,000          
Line of Credit Facility, Potential Maximum Borrowing Capacity, Subject to Additional Commitments   $ 1,500,000 $ 1,500,000                      
Debt Instrument, Interest Rate, Stated Percentage   0.00% 0.00%                      
Debt Instrument, Covenant, Maximum Leverage Ratio   55.00% 55.00%                      
Debt Instrument, Covenant, Minimum Common Stock Outstanding Ownership, Percentage   50.00% 50.00%                      
Long-term Line of Credit, Total   $ 15,000 $ 15,000 15,000                    
Line of Credit Facility, Remaining Borrowing Capacity   957,200 $ 957,200                      
Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate     1.50%                      
Revolving Credit Facility [Member] | Specified Eurocurrency Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate     1.00%                      
Mortgage Repurchase Facility [Member] | Warehouse Agreement Borrowings [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity                   $ 115,000 $ 75,000 $ 75,000    
Line of Credit Facility, Maximum Increase to Borrowing Capacity           $ 130,000 $ 75,000         $ 75,000    
Warehouse Agreement Borrowings, Total   $ 116,800 $ 116,800 $ 112,300