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Long-Term Debt and Credit Arrangements - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Debt Instrument [Line Items]      
Debt, Long-term and Short-term, Combined Amount $ 415,293 $ 382,405 $ 488,692
Less current maturities 48,397 47,286 207,982
Total long-term debt 366,896 335,119 280,710
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 142,500 146,250 150,000
Less current maturities 7,500 7,500 7,500
Total long-term debt 135,000 138,800 142,500
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Credit Agreement revolving credit loan 220,000 197,000 99,000
Convertible Notes [Member]      
Debt Instrument [Line Items]      
Debt, Long-term and Short-term, Combined Amount 0 0 160,765
Other notes payables [Member]      
Debt Instrument [Line Items]      
Other $ 12,793 $ (845) $ (1,073)