Summary of Significant Accounting Policies - Effect of Adoption on Cash Flow (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Changes in restricted cash held in escrow for acquisitions		$ 0
Net cash used in investing activities	$ (44,771)	(179,883)
Decrease in cash, cash equivalents and restricted cash	(42,613)	(6,170)
Cash and cash equivalents and restricted cash, beginning of period	$ 51,133	32,018
Previously Reported
Restricted Cash and Cash Equivalents Items [Line Items]
Changes in restricted cash held in escrow for acquisitions		33
Net cash used in investing activities		(179,850)
Decrease in cash, cash equivalents and restricted cash		(6,137)
Cash and cash equivalents and restricted cash, beginning of period		$ 31,985

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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