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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Supplemental Cash Flow Information [Abstract]    
Interest paid $ 16,982 $ 12,430
Noncash investing and financing activity    
Capital projects incurred but not yet paid 10,744 3,695
Investment merger (decreasing equity method investments and non-controlling interest) 0 8,360
Outstanding receivable for sale of assets 0 4,356
Dividends declared not yet paid 4,663 4,501
Debt resulting from accounting standard adoption 36,953 0
Railcar assets resulting from accounting standard adoption $ 25,643 $ 0