Fair Value Measurements - Goodwill and Asset Impairment (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant and equipment and leasehold intangibles, net		$ 2,500			$ 50,200
Goodwill and asset impairment	$ 2,094	5,500		$ 6,254	451,966
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	0	0		0	351,700
Property, plant and equipment and leasehold intangibles, net	800	2,500		2,000	50,200
Investment in unconsolidated ventures	0	0	$ 33,400	0	33,400
Other intangible assets, net	0	0		2,600	1,700
Assets held for sale	1,300	3,000		1,300	15,000
Other assets, net	0	0		400	0
Goodwill and asset impairment	$ 2,100	$ 5,500		$ 6,300	$ 452,000