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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 |

X
- Definition Term of lessee's capital lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45023-112735 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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