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AOCI (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,414,000  
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,070,000 $ 2,414,000
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 (200,000) 0
Other comprehensive income before reclassifications 517,000 (289,000)
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion (512,000) 14,000
Other Comprehensive Income (Loss), Tax (2,000) 103,000
Accumulated Other Comprehensive Income (Loss), Net of Tax (197,000) (200,000)
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 2,614,000 2,645,000
Other comprehensive income before reclassifications (417,000) 319,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (347,000) (336,000)
Other Comprehensive Income (Loss), Tax 255,000 (14,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,267,000 2,614,000
Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,414,000 2,645,000
Other comprehensive income before reclassifications 100,000 30,000
Amounts reclassified from accumulated other comprehensive income, before tax (859,000) (350,000)
Other Comprehensive Income (Loss), Tax 253,000 89,000
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,070,000 $ 2,414,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 162,000  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 162,000