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Cash flow information (Details 1) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Interest, net [1] $ 17,910,000 $ 17,546,000
Income taxes paid (refunded), net [2] (1,056,000) (2,762,000)
AFUDC borrowed 382,000 196,000
Property, plant and equipment additions in accounts payable 16,829,000 5,212,000
Continuing and discontinued operations    
Income taxes paid (refunded), net $ 1,700,000 $ (7,200,000)
[1] AFUDC - borrowed was $382,000 and $196,000 for the three months ended March 31, 2018 and 2017, respectively.
[2] Income taxes paid (refunded), net of discontinued operations, were $1.7 million and $(7.2) million for the three months ended March 31, 2018 and 2017, respectively.