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Borrowings - Principle Maturities of Borrowings and Credit Arrangements (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2019 (April - December) $ 15,876  
2020 26,666  
2021 28,000  
2022 117,000  
2023 0  
Thereafter 150,000  
Total 337,542  
Notes | 3.50% Convertible Senior Notes due October 1, 2024    
Debt Instrument [Line Items]    
2019 (April - December) 0  
2020 0  
2021 0  
2022 0  
2023 0  
Thereafter 150,000  
Total 150,000 $ 150,000
Structured Payables    
Debt Instrument [Line Items]    
2019 (April - December) 876  
2020 666  
2021 0  
2022 0  
2023 0  
Thereafter 0  
Total 1,542 $ 2,114
Revolver Credit    
Debt Instrument [Line Items]    
2019 (April - December) 15,000  
2020 26,000  
2021 28,000  
2022 117,000  
2023 0  
Thereafter 0  
Total $ 186,000