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Borrowings - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Aug. 16, 2019
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 200,000		$ 200,000
Interest expense	2,600	$ 2,600	5,300	$ 5,300
Level 2
Debt Instrument [Line Items]
Borrowings fair value	205,200		205,200
Series B Senior Notes | Senior notes
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 50,000		$ 50,000
Interest Rate Per Annum	5.32%		5.32%
Subsequent Event | Series E Senior Notes
Debt Instrument [Line Items]
Debt and capital lease obligations					$ 50,000
Interest Rate Per Annum					4.53%

X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

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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
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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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