XML 92 R65.htm IDEA: XBRL DOCUMENT v3.3.1.900
Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]                            
Net investment income earned $ 30,108 $ 32,061 $ 32,230 $ 26,917 $ 32,108 $ 34,292 $ 36,774 $ 35,534 $ 121,316   $ 138,708   $ 134,643  
Investments Accounted For Under The Equity Method [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Net Investment Income                   $ 129,000   $ 226,000   $ 406,000
Realized gains                   1,187,000   581,000   913,000
Net change in unrealized (depreciation) appreciation                   (1,364,000)   1,098,000   382,000
Net Income                   $ (48,000)   $ 1,905,000   $ 1,701,000
Partnership Interest [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Net investment income earned                 $ (1,900)   $ 13,600   $ 15,200