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Long-Term Indebtedness (Narrative) (Details) |  |  |  |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 07, 2021 USD ($) | May 13, 2021 USD ($) tradingDay | Dec. 19, 2019 | Mar. 29, 2019 USD ($) | Dec. 14, 2018 USD ($) | Apr. 27, 2016 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Feb. 24, 2014 USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  |  |  |  | $ 1,101,787,000 |  | $ 1,231,959,000 |
Proceeds from issuance of convertible notes |  |  |  |  |  |  | $ 0 | $ 460,000,000 |  |
Percentage of equity interests of controlled foreign corporations (up to) |  |  |  |  |  |  | 65.00% |  |  |
Level 1 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Convertible debt, fair value |  |  |  |  |  |  | $ 415,200,000 |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt, face amount | $ 400,000,000 |  |  |  |  |  |  |  |  |
Term Loan | Period one |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 1.25% |  |  |  |  |  |  |  |  |
Debt term |  |  | 2 years |  |  |  |  |  |  |
Term Loan | Period two |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 1.875% |  |  |  |  |  |  |  |  |
Term Loan | Period three |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 2.50% |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt, face amount |  | $ 460,000,000 |  |  |  |  |  |  |  |
Stated interest rate |  | 1.125% |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes |  | $ 447,800,000 |  |  |  |  |  |  |  |
Debt, conversion ratio |  | 0.0060369 |  |  |  |  |  |  |  |
Redemption price, percentage |  | 100.00% |  |  |  |  |  |  |  |
Amount of principal held |  | 25.00% |  |  |  |  |  |  |  |
Convertible Notes | Period one |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Threshold trading days | tradingDay |  | 20 |  |  |  |  |  |  |  |
Threshold consecutive trading days | tradingDay |  | 30 |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  | 130.00% |  |  |  |  |  |  |  |
Convertible Notes | Period two |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  | 98.00% |  |  |  |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Letter of credit |  |  |  |  |  |  | 29,400,000 |  |  |
Remaining availability under the facilities |  |  |  |  |  |  | $ 286,700,000 |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.175% |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.15% |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.225% |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Letter of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  |  |  | $ 50,000,000 |  |  |  |
Prudential Investment Management Inc | Line of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  | $ 50,000,000 | $ 400,000,000 |  |  |  |  |
Remaining availability under the facilities |  |  |  |  |  |  |  |  |  | $ 200,000,000
Debt term |  |  |  | 3 years |  |  |  |  |  |
Interest rate during period |  |  |  | 3.80% |  |  |  |  |  |
Prudential Investment Management Inc | Line of Credit | New Term Loan, Amendment No. 4 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Long-term indebtedness | $ 400,000,000 |  |  |  |  |  |  |  |  |
JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  |  | $ 600,000,000 |  |  |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate |  |  |  |  |  |  | 0.125% |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate |  |  |  |  |  | 0.00% |  |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate |  |  |  |  | 0.625% |  |  |  |  |
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 1.125% |  |  |
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 0.875% |  |  |
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate |  |  |  |  | 1.625% |  |  |  |  |

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