Derivative Instruments and Hedging Activities	3 Months Ended
Derivative Instruments and Hedging Activities	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	(i) interest rate swap agreements (which are designated as cash flow hedges) and (ii) cross-currency swap agreements (which are designated as net investment hedges). Interest Rate Swap Agreements Designated as Cash Flow Hedges In March 2018, we entered into interest rate swap agreements to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness. As of March 31, 2020 and December 31, 2019, we had $350,000 in notional value of interest rate swap agreements outstanding, which expire in March 2022. Under the interest rate swap agreements, we receive variable rate interest payments associated with the notional amount of each interest rate swap, based upon one-month LIBOR, in exchange for the payment of fixed interest rate payments (at the fixed interest rate specified in the interest rate swap agreements). In July 2019, we entered into forward-starting interest rate swap agreements to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness once our current interest rate swap agreements expire in March 2022. The forward-starting interest rate swap agreements have $350,000 in notional value, commence in March 2022 and expire in March 2024. Under the swap agreements we will receive variable rate interest payments based upon one-month LIBOR, in exchange for the payment of fixed interest rate payments at the rates specified in the interest rate swap agreements. We have designated these interest rate swap agreements, including the forward-starting interest rate swap agreements, as cash flow hedges. Unrealized gains are recognized as assets while unrealized losses are recognized as liabilities. At March 31, 2020 and December 31, 2019, we had a derivative liability of $23,506 and $8,774, respectively, which was recorded as a component of Other long-term liabilities in our Condensed Consolidated Balance Sheets. We have recorded the change in fair value of the interest rate swap agreements as a component of Accumulated other comprehensive items, net in our Condensed Consolidated Balance Sheets. We have recorded unrealized losses of $14,732 and $2,674 for the three months ended March 31, 2020 and 2019, respectively. As of March 31, 2020, cumulative net losses of $23,506 are recorded within Accumulated other comprehensive items, net associated with these cash flow hedges. Net Investment Hedges a. Cross-Currency Swap Agreements Designated as a Hedge of Net Investment In August 2019, we entered into cross-currency swap agreements to hedge the variability of exchange rate impacts between the United States dollar and the Euro. Under the terms of the cross-currency swap agreements, we notionally exchanged approximately $110,000 at an interest rate of 6.0% for approximately 99,055 Euros at a weighted average interest rate of approximately 3.65%. The cross-currency swap agreements, which expire in August 2023, are designated as a hedge of net investment against certain of our Euro denominated subsidiaries and require an exchange of the notional amounts at maturity. The cross-currency swaps are marked to market at each reporting period and any changes in fair value are recognized as a component of Accumulated other comprehensive items, net. Unrealized gains are recognized as assets while unrecognized losses are recognized as liabilities. At March 31, 2020, we had a derivative asset of $5,388, which was recorded as a component of Other within Other assets, net and at December 31, 2019, we had a derivative liability of $982, which was recorded as a component of Other long-term liabilities, net in our Condensed Consolidated Balance Sheets. These amounts represent the fair value of the cross-currency swap agreements. We have recorded unrealized gains of $6,370 for the three months ended March 31, 2020 associated with these cross-currency swap agreements. As of March 31, 2020, cumulative net gains of $5,388 are recorded within Accumulated other comprehensive items, net associated with this net investment hedge. b. Euro Notes Designated as a Hedge of Net Investment In addition, we have designated a portion of our Euro Notes as a hedge of net investment of certain of our Euro denominated subsidiaries. For the three months ended March 31, 2020 and 2019, we designated, on average, 300,000 and 271,146 Euros, respectively, of our Euro Notes as a hedge of net investment of certain of our Euro denominated subsidiaries. As a result, we recorded foreign exchange gains of $6,453 and $6,141 for the three months ended March 31, 2020 and 2019, respectively, related to the change in fair value of such debt due to currency translation adjustments, which is a component of Accumulated other comprehensive items, net. As of March 31, 2020, cumulative net gains of $26,714, net of tax, are recorded in Accumulated other comprehensive items, net associated with this net investment hedge.