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Investment Securities Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 133,282 $ 162,168
Gross Unrealized Gains 19,656 19,885
Gross Unrealized Losses (238) (77)
Fair Value 152,700 181,976
Marketable equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost 37,947 47,502
Gross Unrealized Gains 18,822 19,833
Gross Unrealized Losses (238) (62)
Fair Value 56,531 67,273
Mutual funds invested in fixed income securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost 20,215 20,126
Gross Unrealized Gains 77 0
Gross Unrealized Losses 0 (15)
Fair Value 20,292 20,111
Marketable debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost 75,120 94,540
Gross Unrealized Gains 757 52
Gross Unrealized Losses 0 0
Fair Value $ 75,877 $ 94,592