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Fair Value Measurements - Goodwill and Asset Impairment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property, plant and equipment and leasehold intangibles, net   $ 40,800
Goodwill and asset impairment $ 391 430,363
Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill   351,700
Property, plant and equipment and leasehold intangibles, net   40,800
Investment in unconsolidated ventures   33,400
Other intangible assets, net   1,700
Assets held for sale   2,800
Goodwill and asset impairment   $ 430,400