Cash and Cash Equivalents and Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Cash and Cash Equivalents and Fair Value of Financial Instruments	Cash and Cash Equivalents and Fair Value of Financial Instruments Cash and cash equivalents of $629.2 million and $127.2 million as of September 30, 2020 and December 31, 2019, respectively, consisted of bank accounts with major financial institutions. Fair Value Hierarchy The Company measures its financial instruments at fair value. The Company’s cash and cash equivalents are classified within Level 1 of the fair value hierarchy as they are valued primarily using quoted market prices utilizing market observable inputs. The Company's interest rate swap contracts and credit facilities are classified within Level 2 as the valuation inputs are based on quoted prices or market observable data of similar instruments. The Company's convertible senior notes are classified within Level 2 as the valuation inputs are based on quoted prices in an inactive market on the last day in the reporting period. As of September 30, 2020, the fair value of the convertible senior notes was $592.2 million, compared to their carrying value of $462.1 million, which is net of unamortized discount and debt issuance costs and excludes amounts classified within additional paid-in capital. Refer to Note 8, Debt and Credit Agreements, for further information regarding the Company’s credit facilities and Note 9, Convertible Senior Notes for further information regarding the Company’s convertible senior notes. Interest Rate Swap Contracts The Company uses interest rate swap agreements to protect the Company against adverse fluctuations in interest rates by reducing its exposure to variability in cash flows relating to interest payments on a portion of its outstanding debt. The Company’s interest rate swaps, which are designated as cash flow hedges, involve the receipt of variable amounts from counterparties in exchange for the Company making fixed-rate payments over the life of the agreements. The Company does not hold or issue any derivative financial instruments for speculative trading purposes. During 2016, the Company entered into an interest rate swap agreement with a combined notional amount of $100.0 million with one counterparty that became effective on June 30, 2016 and matured on April 30, 2019. The swap agreement required the Company to pay a fixed rate of 0.8% and provided that the Company received a variable rate based on the one month London Interbank Offered Rate (“LIBOR”), subject to a LIBOR floor of 0.0%. Amounts payable by or due to the Company were net settled with the respective counterparty on the last business day of each month, commencing July 31, 2016.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.