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Leases (Narrative) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Operating lease right-of-use asset | $ 29,632 |  |  | $ 20,700 |  |  |  |
Operating lease liability | 30,336 |  |  | 21,000 |  |  |  |
Finance lease right-of-use asset | 1,106 |  |  | 900 |  |  |  |
Finance lease liabilities | $ 1,109 | [1] |  | 900 | $ 0 | [1] |  |
Retained Earnings [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  | $ 0 | $ 300 | $ 342 |  | $ 0 | $ 0
[1] | Concurrent with the adoption of ASU 2016-02 discussed in Note 2. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.

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