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Product Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Product warranty reserves [Roll Forward]        
Reserve balance, beginning of the period $ 11,051 $ 16,013 $ 10,928 $ 15,410
Warranty liabilities accrued 1,750 4,076 4,496 7,529
Warranty liabilities settled (2,644) (3,851) (5,287) (6,676)
Pellet plant agreement write-off 0 (4,806) 0 (4,806)
Other (40) 112 (20) 87
Reserve balance, end of the period $ 10,117 $ 11,544 $ 10,117 $ 11,544
Minimum [Member]        
Standard Product Warranty Disclosure [Abstract]        
Product warranty reserve term     three months  
Maximum [Member]        
Standard Product Warranty Disclosure [Abstract]        
Product warranty reserve term     two years