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Long-Term Indebtedness (Narrative) (Details) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 27, 2016 | Mar. 20, 2015 | Dec. 31, 2018 | Dec. 14, 2018 | Dec. 31, 2017 | Mar. 30, 2017 | Feb. 24, 2014
Line of Credit Facility |  |  |  |  |  |  |
Long-term indebtedness |  |  | $ 293,528,000 |  | $ 49,924,000 |  |
Maximum |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Ownership percentage |  |  | 65.00% |  |  |  |
Line of Credit |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Remaining availability under the facilities |  |  | $ 507,700,000 |  |  |  |
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 |  |  | 2,200,000 |  | $ 2,400,000 |  |
Remaining availability under the facilities |  |  | $ 357,700,000 |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Interest rate |  |  | 1.00% |  |  |  |
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 |  |  |
Additional maximum borrowing capacity upon approval |  |  |  | 300,000,000.0 |  |  |
Prudential Investment Management Inc | Line of Credit |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Long-term indebtedness |  | $ 50,000,000.0 |  | $ 250,000,000.0 |  |  |
Remaining availability under the facilities |  |  |  |  |  | $ 150,000,000.0 | $ 150,000,000.0
Weighted average interest rate |  | 3.35% |  |  |  |  |
Debt instrument term (in years) |  | 5 years |  |  |  |  |
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 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 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 |  |  |  |  |  |  |
Interest 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 | 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 | LIBOR | Maximum |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Interest rate |  |  | 1.625% |  |  |  |

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