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Long-Term Debt and Credit Arrangements - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Debt Instrument [Line Items]      
Debt, Long-term and Short-term, Combined Amount $ 380,571 $ 382,405 $ 223,309
Less current maturities 47,281 47,286 47,298
Total long-term debt 333,290 335,119 176,011
Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt, Long-term and Short-term, Combined Amount 40,000 40,000 80,000
Term Loan [Member]      
Debt Instrument [Line Items]      
Debt, Long-term and Short-term, Combined Amount 144,375 146,250 88,750
Less current maturities 7,500 7,500 7,500
Total long-term debt 136,900 138,800 81,300
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Credit Agreement revolving credit loan 197,000 197,000 55,000
Other notes payables [Member]      
Debt Instrument [Line Items]      
Debt issuance costs $ (804) $ (845) $ (441)