Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 5,994	$ 5,583	$ 5,118
Charged to (Reduction in) Costs and Expenses	1,936	1,518	3,610
Other	551	290	1,099
Deductions	(1,805)	(1,397)	(4,244)
Balance at End of Period	6,676	5,994	5,583
Deferred tax asset valuation allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	40,966	21,755	12,048
Charged to (Reduction in) Costs and Expenses	118,125	17,419	9,707
Other	(3,250)	1,792	0
Deductions	0	0	0
Balance at End of Period	$ 155,841	$ 40,966	$ 21,755