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Notes Payable and Other Noncurrent Liabilities - Current and Noncurrent Portions of Notes Payable (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 22, 2019	Dec. 31, 2019	Sep. 30, 2020
Notes Payable and Other Noncurrent Liabilities
Less: Current portion		$ 33,144	$ 33,144
Notes payable, less current portion		107,774	82,916
Amended and restated credit agreement
Notes Payable and Other Noncurrent Liabilities
Notes payable including current portion		140,918	116,060
Less: Current portion		33,144	33,144
Notes payable, less current portion		107,774	82,916
Amended and restated credit agreement | 30-Day LIBOR
Notes Payable and Other Noncurrent Liabilities
Margin on variable interest rate	2.00%
Amended and restated credit agreement | Term loan facility
Notes Payable and Other Noncurrent Liabilities
Quarterly payment of notes payable			8,368
Notes payable including current portion		$ 140,918	$ 116,060
Amended and restated credit agreement | Term loan facility | 30-Day LIBOR
Notes Payable and Other Noncurrent Liabilities
Margin on variable interest rate		2.00%
Interest rate of notes payable			2.16%
Amended and restated credit agreement | Revolving credit facility | 30-Day LIBOR
Notes Payable and Other Noncurrent Liabilities
Margin on variable interest rate		2.00%
Interest rate of notes payable			2.16%

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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