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Debt and Credit Agreements (Details 3)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]    
Debt Instrument, Covenant Minimum Consolidated Interest Coverage Ratio, Numerator 3.0  
Total debt obligations $ 605,394 $ 593,659
Less: deferred financing costs (13,243) (15,657)
Total debt obligations, net of deferred financing costs 592,151 578,002
Less: current maturities of long-term debt (6,489) (11,208)
Long-term debt 585,662 566,794
Maturities of Long-term Debt [Abstract]    
2019 5,953  
2020 67,507  
2021 5,445  
2022 5,445  
Revolving Credit Facility    
Debt Instrument [Line Items]    
Total debt obligations $ 62,000 $ 41,000
Variable interest rate 4.20% 3.60%
Line of Credit [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Covenant Minimum Consolidated Interest Coverage Ratio, Numerator 3.75  
Term Loan    
Debt Instrument [Line Items]    
Total debt obligations $ 541,788 $ 545,875
Variable interest rate 4.80% 4.60%
Other financing payable in varying amounts due principally through 2018 with a weighted-average interest rate of 2.7% and 9.4% at December 31, 2012 and 2011, respectively    
Debt Instrument [Line Items]    
Total debt obligations $ 1,606 $ 6,784
Weighted average interest rate 5.00% 5.70%
Consolidated Adjusted EBITDA Ratio Covenant After Year End | Line of Credit [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Covenant Minimum Consolidated Interest Coverage Ratio, Numerator 3.5