Convertible Debt - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
Mar. 31, 2018 USD ($) SinkingFund $ / shares	Mar. 31, 2018 USD ($) d SinkingFund $ / shares shares
Debt Instrument [Line Items]
Net proceeds from offering	$ 139,400
Notes initial conversion rate of common stock \| shares		25.4544
Conversion rate of common stock per principal amount of Notes \| $ / shares		$ 1,000
Debt instrument conversion price per share \| $ / shares	$ 39.29	$ 39.29
Debt instrument shares issuable upon conversion \| shares		3,700,000
Convertible notes, conversion start date		Jan. 01, 2023
Number of consecutive trading days \| d		30
Debt discount recorded in additional paid-in-capital	$ 32,643	$ 32,643
Issuance costs attributable to liability component		3,600
Issuance costs attributable to equity component		$ 1,100
Class A Common Stock
Debt Instrument [Line Items]
Debt instrument shares issuable upon conversion \| shares		3,585,647
Initial strike price \| $ / shares	39.29	39.29
Cap price \| $ / shares	60.44	60.44
Cost of purchased capped calls		$ 17,100
Closing Price of common stock \| $ / shares	$ 28.34	$ 28.34
LIBOR \| Interest Rate Swap
Debt Instrument [Line Items]
Derivative contract term		5 years
Minimum
Debt Instrument [Line Items]
Number of trading days \| d		20
Conversion Condition One
Debt Instrument [Line Items]
Number of consecutive trading days \| d		30
Minimum percentage of conversion price		130.00%
Conversion Condition One \| Minimum
Debt Instrument [Line Items]
Number of trading days \| d		20
Conversion Condition Two
Debt Instrument [Line Items]
Number of consecutive trading days \| d		5
Number of business days		5 days
Notes measurement maximum percentage		98.00%
Convertible Debt
Debt Instrument [Line Items]
Convertible senior notes	$ 143,750	$ 143,750
Convertible senior notes percentage	0.875%	0.875%
Debt instrument due date	Apr. 01, 2023
Debt instrument, description	Interest is payable semiannually in arrears on April 1 and October 1 of each year, commencing on October 1, 2018.
Convertible notes redemption period		Apr. 05, 2021
Number of trading days to provide notice of redemption		3 days
Redemption price, percentage		100.00%
Number of sinking fund provided for notes \| SinkingFund	0	0
6.34% Convertible Notes
Debt Instrument [Line Items]
Estimated implied interest rate on notes	6.34%	6.34%
Fair value of liability component	$ 110,000	$ 110,000
Debt discount recorded in additional paid-in-capital	$ 33,800	$ 33,800

Closing price of common stock.

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Cost of purchased capped calls.

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Debt instrument convertible threshold business days.

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Debt instrument implied interest rate.

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Issuance cost attributable to equity component.

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Issuance cost attributable to liability component.

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Notes initial conversion rate of common stock.

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Notes measurement maximum percentage.

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Number of sinking fund provided for notes.

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Number of trading days to provide notice of redemption.

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The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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The price per share of the conversion feature embedded in the debt instrument.

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Earliest date when the debt instrument can be converted into equity, in CCYY-MM-DD format.

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Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Start date of debt instrument redemption period, in CCYY-MM-DD format.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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The strike price on the price risk option contract such as a put option or a call option.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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