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Long-Term Indebtedness (Narrative) (Details) € in Millions |  |  |  |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2019 USD ($) | Mar. 29, 2019 USD ($) | Dec. 14, 2018 USD ($) | Apr. 27, 2016 USD ($) | Mar. 20, 2015 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 EUR (€) | Dec. 31, 2019 USD ($) | Nov. 11, 2019 USD ($) | Feb. 24, 2014 USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  |  |  | $ 750,519,000 |  | $ 612,906,000 |  |
Borrowings |  |  |  |  |  | 768,818,000 |  | $ 630,789,000 |  |
Remaining availability under the facilities |  |  |  |  |  | 341,700,000 |  |  |  |
Medium-term Notes [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 300,000,000.0 |  |  |  |  |  |  |  |  |
Medium-term Notes [Member] | Period one |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt term | 2 years |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.25% |  |  |  |  |  |  |  |  |
Medium-term Notes [Member] | Period two |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.875% |  |  |  |  |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  | $ 325,000,000.0 |  |  |  |  |  |
Long-term indebtedness |  |  | $ 250,000,000.0 |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | 138,300,000 | € 126.0 |  |  |
Letter of credit |  |  |  |  |  | 2,700,000 |  |  |  |
Remaining availability under the facilities |  |  |  |  |  | $ 191,700,000 |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.00% |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.00% |  |  |  |
Prudential Investment Management Inc | Line of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Long-term indebtedness |  | $ 50,000,000.0 |  |  | $ 50,000,000.0 |  |  |  | $ 200,000,000.0 |
Remaining availability under the facilities |  |  |  |  |  |  |  |  |  | $ 150,000,000.0
Debt term |  | 3 years |  |  | 5 years |  |  |  |  |
Interest rate during period |  | 3.80% |  |  | 3.35% |  |  |  |  |
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 | $ 900,000,000.0 |  | $ 600,000,000.0 |  |  |  |  |  |  |
Line of Credit Facility, Additional Maximum Borrowing Capacity Upon Approval | $ 300,000,000.0 |  |  |  |  |  |  |  |  |
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% |  | 0.40% |  |  |  |
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 One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | Federal Funds Effective Rate |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.50% |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.625% |  |  |  |  |  |  |

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