Financial Instruments And Investments (Unrecognized Gross Unrealized Gains And The Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	$ 189,706	$ 140,096
Cash and Cash Equivalents, at Carrying Value	10,044	8,149	$ 12,573	$ 40,504
Available-for-sale Securities, Gross Unrealized Gain	40,144	38,366
Debt Securities
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	80,124	40,403
Available-for-sale Securities, Gross Unrealized Gain	3,731	1,274
Collateralized Mortgage Backed Securities
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	16,772	9,589
Available-for-sale Securities, Gross Unrealized Gain	701	438
U.S. Government Bonds
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	35,711	12,033
Available-for-sale Securities, Gross Unrealized Gain	1,285	136
Municipal Bonds
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	9,273	8,671
Available-for-sale Securities, Gross Unrealized Gain	398	332
Corporate Debt Securities
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	18,368	10,110
Available-for-sale Securities, Gross Unrealized Gain	1,347	368
Equity Securities
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	66,055	72,636
Available-for-sale Securities, Gross Unrealized Gain	34,418	37,001
Mutual Funds - Equity
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	35,552	18,853
Available-for-sale Securities, Gross Unrealized Gain	1,995	91
Cash and Cash Equivalents
Financial Instruments and Investments [Line Items]
Cash and Cash Equivalents, at Carrying Value	7,975	8,204
Available-for-sale Securities, Gross Unrealized Gain	$ 0	$ 0