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Long-Term Indebtedness (Narrative) (Details) - USD ($) |  |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2019 | Dec. 14, 2018 | Apr. 27, 2016 | Mar. 20, 2015 | Feb. 24, 2014 | Mar. 31, 2019 | Dec. 31, 2018
Line of Credit Facility |  |  |  |  |  |  |
Long-term indebtedness |  |  |  |  |  | $ 286,311,000 | $ 293,528,000
Remaining availability under the facilities |  |  |  |  |  | $ 514,400,000 |
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 |  |  |  |
Letter Of Credit |  |  |  |  |  | $ 2,600,000 |
Remaining availability under the facilities |  |  |  |  |  | $ 364,400,000 |
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 |  | 250,000,000.0 |  | $ 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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