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Debt:Term Loan (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) Integer9 Integer8 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Repayments of Long-term Debt |  | $ 410,400 | $ 754,071 | $ 0 |
Term Loan Due 2026 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 75,000
Debt Instrument, Periodic Payment, Principal |  | $ 10,000 |  |  |
Debt Instrument, Date of First Required Payment |  | Mar. 30, 2022 |  |  |
Debt Instrument, Frequency of Periodic Payment |  | annual |  |  |
Repayments of Long-term Debt | $ 30,000 |  | 30,000 |  |
Debt Instrument, Unused Borrowing Capacity, Amount | $ 30,000 |  | $ 30,000 |  |
Number of reborrowing instances allowed | Integer8 |  | 3 |  |  |
Minimum reborrowing amounts |  | $ 10,000 |  |  |
Debt Instrument, Unused Borrowing Capacity, Fee (as a percentage) |  | 0.325% |  |  |
Debt Instrument, Covenant, Capitalization Ratio, Maximum (as a percent) |  | 60.00% |  |  |
Debt Instrument, Covenant, Consolidated Net Worth, Minimum |  | $ 350,000 |  |  |
Debt Instrument, Covenant, Available Liquidity, Minimum |  | 100,000 |  |  |
Threshold of amount of capital expenditures made during four consecutive quarters, maximum |  | $ 50,000 |  |  |
Number of Consecutive Quarters Within Which Maixmum Threshold Amount Of Capital Expenditures Applies | Integer9 |  | 4 |  |  |
Dividend restriction, interest coverage ratio (as a percent) |  | 300.00% |  |  |
Dividend restriction, fixed-charge coverage ratio (as a percent) |  | 100.00% |  |  |
Debt Instrument, Interest Rate During Period |  | 2.95% |  |  |
Debt Instrument, Interest Rate During Period With Patronage Credits |  | 2.20% |  |  |
Term Loan Due 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rate |  | 1.875% |  |  |
Term Loan Due 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rate |  | 2.125% |  |  |
Term Loan Due 2026 [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rate |  | 0.875% |  |  |
Term Loan Due 2026 [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rate |  | 1.125% |  |  |

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