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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Deferred tax not recongized $ 14,900 $ 14,900 $ 14,900  
Deferred Tax Assets, Net 12,563 6,235 12,563  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 2,500 $ 0 2,487  
Reclassification for the Tax Cuts and Jobs Act       $ 0
Retained Earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification for the Tax Cuts and Jobs Act       (60)
Retained Earnings | Accounting Standards Update 2018-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification for the Tax Cuts and Jobs Act (60,000)   (60,000)  
Accumulated Other Comprehensive Income (Loss)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification for the Tax Cuts and Jobs Act       $ 60
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2018-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification for the Tax Cuts and Jobs Act $ 60,000   $ 60,000