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Leases Leases:Topic 840 Disclosure (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Jan. 01, 2019
Operating Leases, Rent Expense, Net [Abstract]        
Rent Expense $ 18,200 $ 19,300    
Property, Plant and Equipment [Line Items]        
Property and equipment, net 487,224   $ 476,949 $ 465,492
Operating lease right-of-use assets 0   $ 64,228 $ 69,155
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
2019 13,222      
2020 12,734      
2021 11,595      
2022 10,208      
2023 9,800      
Thereafter 40,381      
Operating Lease Total 97,940      
Capital Leases, Future Minimum Payments, Net Minimum Payments, Fiscal Year Maturity [Abstract]        
2019 2,578      
2020 2,617      
2021 2,656      
2022 2,694      
2023 2,740      
Thereafter 30,177      
Capital Lease Total 43,462      
Less - interest on capital lease obligations (20,838)      
Total principal payable on capital lease obligations 22,624      
Less - current obligations (703)      
Property, Plant and Equipment [Member]        
Property, Plant and Equipment [Line Items]        
Capital Leased Assets, Gross 23,700      
Other Noncurrent Liabilities [Member]        
Capital Leases, Future Minimum Payments, Net Minimum Payments, Fiscal Year Maturity [Abstract]        
Capital Lease Obligations, Noncurrent 21,921      
Buildings [Member]        
Property, Plant and Equipment [Line Items]        
Lease Obligation Incurred $ 18,900      
Buildings [Member] | Capital Lease 1 [Member]        
Property, Plant and Equipment [Line Items]        
Lessee, Capital Lease, Term of Contract 13 years      
Buildings [Member] | Capital Lease 2 [Member]        
Property, Plant and Equipment [Line Items]        
Lessee, Capital Lease, Term of Contract 20 years