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Goodwill and Intangible Assets (Composition of Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 90,375 | $ 88,883 | $ 92,279
Total intangible assets | 36,576 | 36,480 |
Accumulated amortization | (19,768) | (17,899) |
Total intangible assets, net | 16,808 | 18,581 |
Licenses And Others [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 5,415 | 5,406 |
Non-Compete Agreement [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 2,803 | 3,028 |
Customer Lists [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 14,915 | 14,897 |
Trademarks [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 4,680 | 4,565 |
Trademarks [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Intangible assets with indefinite lives | $ 8,763 | $ 8,584 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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