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Debt Debt:Term Loan (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Mar. 31, 2018
USD ($)
Integer9
Integer8
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 30, 2016
USD ($)
Debt Instrument [Line Items]          
Repayments of Long-term Debt   $ 2,800 $ 149,600    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rate   1.25%      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rate   1.75%      
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rate   0.25%      
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rate   0.75%      
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      
NumberofConsecutiveQuartersWithinWhichMaixmumThresholdAmountOfCapitalExpendituresApplies | 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   3.48%      
Debt Instrument, Interest Rate During Period With Patronage Credits   2.70%      
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%