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Fair Value Measurements - Goodwill and Asset Impairment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Property, plant and equipment and leasehold intangibles, net   $ 6,900     $ 47,700
Goodwill and asset impairment $ 3,769 16,103   $ 4,160 446,466
Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill   0     351,700
Property, plant and equipment and leasehold intangibles, net   6,900     47,700
Investment in unconsolidated ventures   0 $ 33,400   33,400
Other intangible assets, net   0     1,700
Assets held for sale   9,200     12,000
Goodwill and asset impairment   $ 16,100     $ 446,500