Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Restricted cash	$ 2,100,000		$ 2,100,000			$ 2,000,000.0
Allowance for doubtful accounts	6,100,000		6,100,000			7,300,000
Transaction losses included in selling, general and administrative expense	600,000	$ 100,000	200,000	$ 1,200,000
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use assets	43,307,000		43,307,000
Present value of lease liabilities	$ 44,436,000		$ 44,436,000
Renewal terms (up to)	3 years		3 years
VIE
Variable Interest Entity [Line Items]
Ownership percentage			40.00%
Outstanding borrowings	$ 0		$ 0			$ 0
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use assets					$ 48,100,000
Present value of lease liabilities					$ 48,100,000