Debt - Schedule of Outstanding Debt Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument
Total long-term debt outstanding	$ 700,851	$ 679,996
Less: long-term debt maturing within one year	(41,068)	(35,760)
Total long-term debt	$ 659,783	644,236
Convertible Senior Notes Due 2025
Debt Instrument
Interest rate	1.50%
Total long-term debt outstanding	$ 585,983	568,744
Non-Revolving Loan
Debt Instrument
Total long-term debt outstanding	$ 95,774	103,305
Non-Revolving Loan \| Minimum
Debt Instrument
Interest rate	2.60%
Non-Revolving Loan \| Maximum
Debt Instrument
Interest rate	5.25%
Master Vehicle Loan
Debt Instrument
Total long-term debt outstanding	$ 19,094	$ 7,947
Master Vehicle Loan \| Minimum
Debt Instrument
Interest rate	2.60%
Master Vehicle Loan \| Maximum
Debt Instrument
Interest rate	6.75%

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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