Other Comprehensive Income (Loss) (Change In Accumulated Other Comprehensive Income By Component, Net Of Taxes And Noncontrolling Interest) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income, beginning balance	$ 1,089,805	$ 911,337
Other comprehensive income (loss) before reclassifications	363,195	11,448
Amounts reclassified from accumulated other comprehensive income	(10,118)	(19,476)
Total other comprehensive income (loss)	353,077	(8,028)
Accumulated other comprehensive income, ending balance	1,442,882	903,309
Unrealized Holding Gains On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income, beginning balance	1,131,507	946,933
Other comprehensive income (loss) before reclassifications	355,623	23,088
Amounts reclassified from accumulated other comprehensive income	(10,762)	(20,212)
Total other comprehensive income (loss)	344,861	2,876
Accumulated other comprehensive income, ending balance	1,476,368	949,809
Foreign Currency [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income, beginning balance	(11,246)	(1,075)
Other comprehensive income (loss) before reclassifications	7,572	(11,640)
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income (loss)	7,572	(11,640)
Accumulated other comprehensive income, ending balance	(3,674)	(12,715)
Net Actuarial Pension Loss [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income, beginning balance	(30,456)	(34,521)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	644	736
Total other comprehensive income (loss)	644	736
Accumulated other comprehensive income, ending balance	$ (29,812)	$ (33,785)