Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments (Details)

v3.10.0.1
Derivative Financial Instruments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 24, 2018
USD ($)
derivative_instrument
Dec. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
derivative_instrument
Interest rate swap agreements        
Derivative [Line Items]        
Number of instruments held | derivative_instrument   2   2
Fixed interest rate   2.57%   0.89%
Derivatives, contract termination value $ 500      
Other assets | Interest rate swap agreements        
Derivative [Line Items]        
Notional 75,000   $ 75,000 $ 75,000
Fair Value 923   $ 1,329  
Other long-term liabilities | Interest rate swap agreements        
Derivative [Line Items]        
Notional 100,000 $ 100,000    
Fair Value 413      
Reclassification out of Accumulated Other Comprehensive Income        
Derivative [Line Items]        
Cash flow hedge gain (loss) to be reclassified within 12 months $ (900)