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Long-Term Indebtedness (Narrative) (Details) |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 07, 2021 USD ($) | May 13, 2021 USD ($) tradingDay | Dec. 19, 2019 | Mar. 29, 2019 USD ($) | Apr. 27, 2016 USD ($) | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 14, 2018 USD ($) | Feb. 24, 2014 USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  |  |  | $ 846,834,000 | $ 846,834,000 | $ 1,095,888,000 |  |  |
Long-term debt, net |  |  |  |  |  | 847,423,000 | 847,423,000 | 1,118,974,000 |  |  |
Proceeds from issuance of convertible notes |  |  |  |  |  |  | 0 | 0 | $ 460,000,000 |  |
Level 1 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Convertible Debt, Fair Value Disclosures |  |  |  |  |  | 451,400,000 | $ 451,400,000 |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Face amount | $ 400,000,000 |  |  |  |  |  |  |  |  |  |
Term Loan | Period One |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt instrument term (in years) |  |  | 2 years |  |  |  |  |  |  |  |
Term Loan | Period Two |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt instrument term (in years) |  |  | 2 years |  |  |  |  |  |  |  |
Term Loan | First Eight Quarters |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 1.25% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Prepaid, Principal |  |  |  |  |  | $ 37,500,000 |  |  |  |  |
Term Loan | Next Eight Quarters |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 1.875% |  |  |  |  |  |  |  |  |  |
Term Loan | Thereafter |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 2.50% |  |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Face amount |  | $ 460,000,000 |  |  |  |  |  |  |  |  |
Stated rate |  | 1.125% |  |  |  |  |  |  |  |  |
Debt conversion ratio |  | 0.0060369 |  |  |  |  | 0.0061785 |  |  |  |
Conversion price | $ / shares |  |  |  |  |  | $ 165.65 | $ 165.65 |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes |  | $ 447,800,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Amount of Principal Held, Percent |  | 25.00% |  |  |  |  |  |  |  |  |
Convertible Debt | Period One |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | tradingDay |  | 20 |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | tradingDay |  | 30 |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  | 130.00% |  |  |  |  |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Letter of credit |  |  |  |  |  | $ 4,700,000 | $ 4,700,000 | $ 4,400,000 |  |  |
Remaining availability under the facilities |  |  |  |  |  | $ 245,300,000 | $ 245,300,000 |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.275% |  |  |  |
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 |  |  |  |  |  |  | 0.275% |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  |  | $ 50,000,000 |  |  |  |  |  |
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 |
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 |  |  |  |  |  |  |  |  |  |  | $ 150,000,000
Weighted average interest rate |  |  |  | 3.80% |  |  |  |  |  |  |
Debt instrument term (in years) |  |  |  | 3 years |  |  |  |  |  |  |
Prudential Investment Management Inc | Line of Credit | New Term Loan, Amendment No. 4 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Long-term indebtedness | $ 400,000,000 |  |  |  |  |  |  |  |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt additional margin interest rate |  |  |  |  | 0.00% |  | 0.875% |  |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt additional margin interest 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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 1.875% |  |  |  |
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Interest 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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 1.875% |  |  |  |

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