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Long-Term Indebtedness (Narrative) (Details) - USD ($) |  |  |  | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 27, 2016 | Mar. 20, 2015 | Feb. 24, 2014 | Sep. 30, 2018 | Feb. 28, 2018 | Jan. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 30, 2017 | Mar. 03, 2015
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  | $ 243,504,000 |  |  | $ 49,924,000 | $ 49,918,000 |  |
Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Equity interest percentage | 65.00% |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt weighted average interest rate |  |  |  | 3.00% |  |  |  |  |  |
Remaining availability under the facilities |  |  |  | $ 232,800,000 |  |  |  |  |  |
Maximum leverage ratio |  |  |  | 2.5 |  |  |  |  |  |
Amended Credit Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  |  | $ 325,000,000 | $ 200,000,000 |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 100,000,000
Letters of credit outstanding amount |  |  |  | $ 2,200,000 |  |  |  | $ 2,400,000 |  |
Remaining availability under the facilities |  |  |  | $ 132,800,000 |  |  |  |  |  |
Prudential Investment Management Inc | Line of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Remaining availability under the facilities |  |  | $ 150,000,000.0 |  |  |  |  |  |  |
Long-term indebtedness |  | $ 50,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |  |  |  |
Interest rate during period |  |  |  | 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 | $ 200,000,000.0 |  |  |  |  |  |  |  |  |
Maximum draw capacity in approved foreign currencies | $ 50,000,000.0 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |  |  |
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 | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate | 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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