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Leases (Narrative) (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) item | Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items] |  |
Option to extend, additional periods | 5 years |
Operating lease payments related to options to extend lease terms | $ 2,085,168 |
Operating minimum lease payments | 137,000 | $ 90,484
Future sublease income | $ 9,704 | 11,790
Number of sale leaseback transactions | item | 6 |
Financing liability | $ 2,263 | $ 2,390
Minimum [Member] |  |
Operating Leased Assets [Line Items] |  |
Lessee, Operating Lease, Term of Contract | 1 year |
Maximum [Member] |  |
Operating Leased Assets [Line Items] |  |
Lessee, Operating Lease, Term of Contract | 20 years |

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- Definition Number of sale leaseback transactions + References No definition available. + Details
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- Definition Operating Lease Minimum Lease Payments + References No definition available. + Details
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- Definition Operating lease payments related to options to extend lease terms. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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