Convertible Senior Notes - General (Details) - 2.75% Convertible Senior Notes due 2027		6 Months Ended
	Jun. 11, 2020 USD ($) D $ / shares	Jun. 30, 2020 USD ($)
Debt Instrument [Line Items]
Aggregate principle amount	$ 287,500,000	$ 287,500,000
Interest rate (as a percent)	2.75%	2.75%
Net proceeds from the debt	$ 242,200,000
Threshold trading days | D	20
Threshold consecutive trading days | D	30
Premium percentage on conversion price	130.00%
Number of business days | D	5
Measurement period	10 days
Product of sale price and conversion rate (as a percent)	98.00%
Denomination for conversion of debt	$ 1,000
Conversion ratio	17.8269
Initial conversion price | $ / shares	$ 56.10
Redemption price percentage on principal amount to be redeemed	100.00%
Principal amount of the convertible notes to be repurchased (as a percent)	100.00%
Carrying amount of liability component		$ 189,800,000
Discount rate (as a percent)		9.50%
Carrying amount of the equity component representing the conversion option		$ 97,700,000
Transaction cost on convertible notes		9,600,000
Debt issuance costs		6,300,000
Transaction cost on convertible notes attributable to equity component		$ 3,300,000