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Borrowings - Principle Maturities of Borrowings and Credit Arrangements (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2019 (July - December) $ 10,831  
2020 24,693  
2021 34,000  
2022 49,000  
2023 0  
2024 and thereafter 150,000  
Total 268,524  
Notes | 3.50% Convertible Senior Notes due October 1, 2024    
Debt Instrument [Line Items]    
2019 (July - December) 0  
2020 0  
2021 0  
2022 0  
2023 0  
2024 and thereafter 150,000  
Total 150,000 $ 150,000
Structured Payables    
Debt Instrument [Line Items]    
2019 (July - December) 831  
2020 693  
2021 0  
2022 0  
2023 0  
2024 and thereafter 0  
Total 1,524 $ 2,114
Revolver Credit    
Debt Instrument [Line Items]    
2019 (July - December) 10,000  
2020 24,000  
2021 34,000  
2022 49,000  
2023 0  
2024 and thereafter 0  
Total $ 117,000