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Leases:Topic 840 Disclosure (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2018
Operating Leases, Rent Expense, Net [Abstract]      
Rent expense $ 4,600 $ 13,800  
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)
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
Other Noncurrent Liabilities [Member]      
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]      
Lease Obligation Incurred   $ 18,900  
Capital Lease 1 [Member] | Building [Member]      
Property, Plant and Equipment [Line Items]      
Lessee, Capital Lease, Term of Contract   13 years  
Capital Lease 2 [Member] | Building [Member]      
Property, Plant and Equipment [Line Items]      
Lessee, Capital Lease, Term of Contract   20 years