Annual report pursuant to Section 13 and 15(d)

Long-Term Debt (Schedule Of Long-Term Debt Maturities) (Details)

v3.8.0.1
Long-Term Debt (Schedule Of Long-Term Debt Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 11, 2012
Debt Instrument [Line Items]      
2018 $ 77,842    
2019 164,200    
2020 126,681    
2021 500    
2022 503    
Years subsequent to 2022 236,366    
Long-term Debt, Gross $ 606,092 $ 835,773  
Two Point Five Percentage Convertible Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.50% 2.50% 2.50%