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Property, Plant and Equipment - Depreciation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Property, Plant and Equipment          
Depreciation expense $ 6,480   $ 6,429    
Capitalized depreciation in property, plant and equipment       $ 316 $ 372
Impairment of long-lived assets     0   0
Property, Plant and Equipment          
Property, Plant and Equipment          
Impairment of long-lived assets $ 0 $ 37,775 $ 0   $ 0