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Debt - Convertible Senior Notes and Capped Call (Details) $ / shares in Units, shares in Millions	1 Months Ended	6 Months Ended
	May 31, 2018 USD ($) day $ / shares	Jun. 30, 2018 USD ($) $ / shares shares
Debt Instrument [Line Items]
Conversion price on convertible debt (in USD per share) | $ / shares		$ 40.82
Payment on debt issuance cost		$ 7,946,000
Convertible debt | Convertible Senior Notes
Debt Instrument [Line Items]
Stated interest rate on debt	0.125%
Proceeds from issuance of debt	$ 250,700,000
Conversion ratio on convertible debt	0.0244978
Conversion price on convertible debt (in USD per share) | $ / shares	$ 40.82
Sinking fund payment	$ 0
Conversion option		63,756,000
Effective interest rate on debt	6.39%
Payment on debt issuance cost	$ 8,100,000
Debt issuance costs	$ 6,100,000	$ 5,961,000
Cap price of the Capped Call Transactions (in dollars per share) | $ / shares	$ 62.80
Number of shares covered in the Capped Call Transactions | shares		6.3
Cost of Capped Call Transactions recorded in additional paid in capital		$ 31,412,000
Convertible debt | Convertible Senior Notes | Fundamental change event
Debt Instrument [Line Items]
Debt redemption price as percentage of principal amount	100.00%
Convertible debt | Convertible Senior Notes | On or after May 5, 2021
Debt Instrument [Line Items]
Number of trading days | day	20
Number of consecutive trading days | day	30
Threshold percentage of stock price trigger	130.00%
Debt redemption price as percentage of principal amount	100.00%
Private placement | Convertible debt | Convertible Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount of debt	$ 225,000,000.0
Over-allotment option | Convertible debt | Convertible Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount of debt	$ 33,750,000
Convertible, term one | Convertible debt | Convertible Senior Notes
Debt Instrument [Line Items]
Number of trading days | day	20
Number of consecutive trading days | day	30
Threshold percentage of stock price trigger	130.00%
Convertible, term two | Convertible debt | Convertible Senior Notes
Debt Instrument [Line Items]
Number of trading days | day	5
Number of consecutive trading days | day	5
Threshold percentage of stock price trigger	98.00%

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