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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
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.