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Long-Term Debt and Credit Arrangements - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Debt Instrument [Line Items]      
Debt, Long-term and Short-term, Combined Amount $ 433,722 $ 224,501 $ 240,718
Less current maturities 116,796 46,048 14,796
Total long-term debt 316,926 178,453 225,922
Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt, Long-term and Short-term, Combined Amount 80,000 80,000 120,000
Term Loan [Member]      
Debt Instrument [Line Items]      
Debt, Long-term and Short-term, Combined Amount 148,125 90,000 91,250
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving credit agreement 137,000 55,000 30,000
Convertible Notes [Member]      
Debt Instrument [Line Items]      
Debt, Long-term and Short-term, Combined Amount 69,659 0 0
Other notes payables [Member]      
Debt Instrument [Line Items]      
Debt issuance costs $ (1,062) $ (499) $ (532)