Assets Held for Sale - Carrying Amount of Assets Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets held for sale:
Property, plant and equipment, net	$ 7,589	$ 10,297
Total assets held for sale	$ 7,589	$ 10,297

Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant