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Long-Term Indebtedness (Narrative) (Details) € in Millions |  |  |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2019 | Dec. 14, 2018 USD ($) | Apr. 27, 2016 USD ($) | Mar. 20, 2015 USD ($) | Feb. 24, 2014 USD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  |  |  |  | $ 261,631,000 | $ 293,528,000
Borrowings |  |  |  |  |  |  | 272,386,000 | $ 294,124,000
Remaining availability under the facilities |  |  |  |  |  |  | 548,700,000 |
Percentage of equity interests used as security |  |  |  |  |  | 65.00% |  |
Amended Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  | $ 300,000,000.0 |  |  |  |  |  |
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 |  |  |  |  |  | € 40.0 | 43,700,000 |
Letter of credit |  |  |  |  |  |  | 2,500,000 |
Remaining availability under the facilities |  |  |  |  |  |  | $ 398,700,000 |
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 |  |  |  |  |  | 0.875% |  |
Prudential Investment Management Inc | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  | $ 50,000,000.0 |  |  |  |
Remaining availability under the facilities |  |  |  |  | $ 150,000,000.0 |  |  |
Debt term | 3 years |  |  | 5 years |  |  |  |
Interest rate during period | 3.80% |  |  | 3.35% |  |  |  |
Period after request is issued, by company, for interest payable rate to be determined by Prudential |  |  |  |  | 5 days |  |  |
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 |  | $ 600,000,000.0 |  |  |  |  |  |
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% |  |  | 0.00% |  |
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 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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