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Commitments, Contingencies and Derivatives (Swapped Variable Cost for Fixed Cost and Terms of Interest Rate Swap Agreements) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount $ 43,000 $ 43,000
Derivative, Fair Value, Net (5,682) (7,571)
Interest Rate Swap [Member] | Contract, One    
Derivative [Line Items]    
Notional Amount $ 10,000 10,000
Trade Date Mar. 18, 2009  
Maturity Date Jun. 30, 2021  
Fixed Rate Paid 5.09%  
Derivative, Fair Value, Net $ (272) (527)
Interest Rate Swap [Member] | Contract, Two    
Derivative [Line Items]    
Notional Amount $ 10,000 10,000
Trade Date Jul. 08, 2009  
Maturity Date Jun. 30, 2029  
Fixed Rate Paid 5.84%  
Derivative, Fair Value, Net $ (1,655) (2,133)
Interest Rate Swap [Member] | Contract, Three    
Derivative [Line Items]    
Notional Amount $ 10,000 10,000
Trade Date May 06, 2010  
Maturity Date Jun. 30, 2030  
Fixed Rate Paid 5.71%  
Derivative, Fair Value, Net $ (1,636) (2,129)
Interest Rate Swap [Member] | Contract, Four    
Derivative [Line Items]    
Notional Amount $ 5,000 5,000
Trade Date Mar. 14, 2011  
Maturity Date Mar. 30, 2031  
Fixed Rate Paid 4.35%  
Derivative, Fair Value, Net $ (877) (1,137)
Interest Rate Swap [Member] | Contract, Five    
Derivative [Line Items]    
Notional Amount $ 8,000 8,000
Trade Date May 04, 2011  
Maturity Date Jul. 07, 2031  
Fixed Rate Paid 4.14%  
Derivative, Fair Value, Net $ (1,242) (1,645)
Forward-Starting Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 25,000 50,000
Derivative, Fair Value, Net 30 21
Forward-Starting Interest Rate Swap [Member] | Contract, One    
Derivative [Line Items]    
Notional Amount $ 0 25,000
Trade Date Feb. 25, 2015  
Maturity Date Feb. 25, 2018  
Fixed Rate Paid 1.54%  
Derivative, Fair Value, Net $ 0 20
Forward-Starting Interest Rate Swap [Member] | Contract, Two    
Derivative [Line Items]    
Notional Amount $ 25,000 25,000
Trade Date Feb. 25, 2015  
Maturity Date Feb. 25, 2019  
Fixed Rate Paid 1.74%  
Derivative, Fair Value, Net $ 30 $ 1