Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Cash and Restricted Cash
Restricted cash	$ 2,100,000		$ 2,100,000			$ 2,000,000.0
Accounts receivable
Allowance for doubtful accounts	5,600,000		5,600,000			7,300,000
Recently Adopted Accounting Standards
Operating lease, right-of-use assets	44,673,000		44,673,000
Operating lease, liabilities	$ 45,758,000		$ 45,758,000
Renewal terms (up to)	3 years		3 years
Accounting Standards Update 2016-02
Recently Adopted Accounting Standards
Operating lease, right-of-use assets					$ 48,100,000
Operating lease, liabilities					$ 48,100,000
Selling, general and administrative
Foreign currency translation and transactions
Transaction gains (losses) included in selling, general and administrative expense	$ (100,000)	$ (3,100,000)	$ 400,000	$ (1,100,000)
VIE
Variable interest entities
Ownership percentage			40.00%
Outstanding borrowings	$ 0		$ 0			$ 0