XML 216 R104.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value - Assets and Liabilities that are Measured at Fair Value (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets [Abstract]    
Fair value $ 80,902 $ 106,593
Fair value of derivative instruments 818 87,531
Total assets 81,720 194,124
Liabilities [Abstract]    
Fair value of derivative instruments 7,063 77,826
Total liabilities 7,063 77,826
Student loan and other asset-backed securities [Member]    
Assets [Abstract]    
Fair value 76,866 103,780
Equity securities [Member]    
Assets [Abstract]    
Fair value 3,928 2,694
Debt securities [Member]    
Assets [Abstract]    
Fair value 108 119
Level 1 [Member]    
Assets [Abstract]    
Fair value 4,036 2,813
Fair value of derivative instruments 0 0
Total assets 4,036 2,813
Liabilities [Abstract]    
Fair value of derivative instruments 0 0
Total liabilities 0 0
Level 1 [Member] | Student loan and other asset-backed securities [Member]    
Assets [Abstract]    
Fair value 0 0
Level 1 [Member] | Equity securities [Member]    
Assets [Abstract]    
Fair value 3,928 2,694
Level 1 [Member] | Debt securities [Member]    
Assets [Abstract]    
Fair value 108 119
Level 2 [Member]    
Assets [Abstract]    
Fair value 76,866 103,780
Fair value of derivative instruments 818 87,531
Total assets 77,684 191,311
Liabilities [Abstract]    
Fair value of derivative instruments 7,063 77,826
Total liabilities 7,063 77,826
Level 2 [Member] | Student loan and other asset-backed securities [Member]    
Assets [Abstract]    
Fair value 76,866 103,780
Level 2 [Member] | Equity securities [Member]    
Assets [Abstract]    
Fair value 0 0
Level 2 [Member] | Debt securities [Member]    
Assets [Abstract]    
Fair value $ 0 $ 0