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Leases:Topic 840 Disclosure (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Operating Leases, Rent Expense, Net [Abstract]    
Rent expense $ 4,600  
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
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
Total   43,462
Less - interest on capital lease obligations   (20,838)
Total principal payable on capital lease obligations   22,624
Less - current obligations   (703)
Other Noncurrent Liabilities [Member]    
Property, Plant and Equipment [Line Items]    
Long-term capital lease obligations   21,921
Capital Leases, Future Minimum Payments, Net Minimum Payments, Fiscal Year Maturity [Abstract]    
Long-term capital lease obligations   $ 21,921
Building [Member]    
Property, Plant and Equipment [Line Items]    
Lessee, Capital Lease, Term of Contract 20 years  
Capital Lease Obligations Incurred $ 14,300