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Accumulated Other Comprehensive Loss - Reclassified out of ACOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reclassifications Out of Accumulated Other Comprehensive Income [Line Items]    
Derivatives Reclassification Adjustment from AOCI, net tax $ 136 $ 61
Pension Plan Reclassification Adjustment from AOCI, net tax 275 300
Reclassification from Accumulated Other Comprehensive Income 411 361
Interest Expense [Member]    
Reclassifications Out of Accumulated Other Comprehensive Income [Line Items]    
Derivatives Reclassification Adjustment from AOCI, before tax 136 61
General and Administrative Expense [Member]    
Reclassifications Out of Accumulated Other Comprehensive Income [Line Items]    
Pension Plan Reclassification Adjustment from AOCI, before tax 331 362
Income Tax Expense (Benefit) [Member]    
Reclassifications Out of Accumulated Other Comprehensive Income [Line Items]    
Derivatives Reclassification Adjustment from AOCI, tax 0 0
Pension Plan Reclassification Adjustment from AOCI, tax $ (56) $ (62)