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Borrowings - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 200,000		$ 200,000		$ 200,000
Interest Rate Per Annum					4.29%
Interest expense	2,600	$ 2,700	7,900	$ 8,000
Level 2
Debt Instrument [Line Items]
Borrowings fair value	203,200		203,200
Series B | Senior notes
Debt Instrument [Line Items]
Debt and capital lease obligations	0		0		$ 50,000
Interest Rate Per Annum					5.32%
Series E | Senior notes
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 50,000		$ 50,000		$ 0
Interest Rate Per Annum	4.53%		4.53%

X

- Definition

Amount of short-term and long-term debt and lease obligation.

+ References

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-Publisher FASB
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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- Definition

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

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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