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AOCI (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,070,000  
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,117,000 $ 2,070,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax (197,000) (200,000)
Other comprehensive income before reclassifications (608,000) 517,000
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion 91,000 512,000
Other Comprehensive Income (Loss), Tax 102,000 (2,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax (612,000) (197,000)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   0
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,267,000 2,614,000
Other comprehensive income before reclassifications 910,000 (417,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (325,000) (347,000)
Other Comprehensive Income (Loss), Tax (123,000) 255,000
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,729,000 2,267,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   162,000
Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,070,000 2,414,000
Other comprehensive income before reclassifications 302,000 100,000
Amounts reclassified from accumulated other comprehensive income, before tax (234,000) (859,000)
Other Comprehensive Income (Loss), Tax (21,000) 253,000
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,117,000 2,070,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ 162,000