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Indebtedness (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Indebtedness    
Short-term notes payable $ 94,945  
Long-term debt 94,747 $ 189,605
Senior 5.0% unsecured notes due, 2018 ("Series A Notes")    
Indebtedness    
Fair value of outstanding short-term indebtedness 96,400  
Short-term notes payable 94,900  
Senior 5.75% unsecured notes due, 2021 ("Series B Notes")    
Indebtedness    
Fair value of outstanding long-term indebtedness 102,900  
Long-term debt $ 94,700