Financial Instruments And Investments (Unrecognized Gross Unrealized Gains And The Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	$ 187,022	$ 160,692
Available-for-sale Securities, Gross Unrealized Gain	51,046	47,741
Debt Securities
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	52,961	34,158
Available-for-sale Securities, Gross Unrealized Gain	2,460	1,515
Collateralized Mortgage Backed Securities
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	14,602	9,929
Available-for-sale Securities, Gross Unrealized Gain	676	433
U.S. Government Bonds
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	12,929	6,258
Available-for-sale Securities, Gross Unrealized Gain	285	126
Municipal Bonds
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	13,639	8,783
Available-for-sale Securities, Gross Unrealized Gain	625	450
Corporate Debt Securities
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	11,791	9,188
Available-for-sale Securities, Gross Unrealized Gain	874	506
Equity Securities
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	111,783	103,808
Available-for-sale Securities, Gross Unrealized Gain	48,088	43,145
Common Collective Trust - Equity Funds
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	17,542	0
Available-for-sale Securities, Gross Unrealized Gain	498	0
Equity Mutual Funds
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	0	16,802
Available-for-sale Securities, Gross Unrealized Gain	0	3,081
Cash and Cash Equivalents
Financial Instruments and Investments [Line Items]
Available-for-sale Securities, Unrealized Gain Position, Fair Value	4,736	5,924
Available-for-sale Securities, Gross Unrealized Gain	$ 0	$ 0