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Note 12 - Senior Notes Level 3 (Tables)
12 Months Ended
Dec. 31, 2018
Long-term Debt, Unclassified [Abstract]  
Schedule of Senior Notes [Table Text Block] The carrying value of our senior notes at December 31, 2018 and 2017 was as follows:
 
 
December 31,
($ in thousands) 
 
2018
 
2017
5.500%
Senior Notes due 2019
$
158,324

 
$
157,636

5.250%
Senior Notes due 2020
232,729

 
231,834

7.000%
Senior Notes due 2021
195,867

 
195,146

4.500%
Senior Notes due 2024
443,428

 
442,458

 
Total Senior Notes
$
1,030,348

 
$
1,027,074