Fair Value Measurements - Goodwill and Asset Impairment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill and asset impairment	$ 43,012	$ 2,094	$ 3,769	$ 391	$ 37,927	$ 5,500	$ 16,103	$ 430,363	$ 49,266	$ 489,893	$ 409,782
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill (Note 8)									0	351,700	205,000
Property, plant and equipment and leasehold intangibles, net (Note 7)									27,200	78,000	164,400
Operating lease right-of-use assets (Note 11)									10,200
Investment in unconsolidated ventures (Note 6)									0	33,400	25,800
Other intangible assets, net (Note 8)									10,200
Asset Impairment Charges, Non-Cash Charge									7,600	9,100	14,600
Assets held for sale (Note 4)									1,300	15,600	0
Other intangible assets, net (Note 8)									400	2,100	0
Goodwill and asset impairment									$ 49,300	$ 489,900	$ 409,800