Supplemental Balance Sheet, Income Statement and Cash Flow Information - Acquisitions of Businesses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental cash flow information
Cash paid for income taxes		$ 6,553	$ 11,383
Cash paid for interest, net of capitalized interest	$ 157,437	174,357	202,803
Cash received from income tax refund	17,505
Net change in accounts payable related to capital expenditures	$ (1,188)	(7,624)	(8,556)
Non-cash increase in assets attributable to redeemable noncontrolling interest in subsidiary			43,928
Acquisitions of businesses:
Fair value of assets acquired		2,929	48,053
Goodwill			11,436
Liabilities assumed			(34,489)
Cash paid for acquisitions of businesses		2,929	25,000
Cash and restricted cash acquired in acquisitions of businesses			(4,141)
Cash (acquired in) paid for acquisitions of businesses, net		$ (2,929)	$ (20,859)