Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2012

Investments in Debt and Equity Securities [Abstract]

Amortized costs and fair values

	June 30, 2012				December 31, 2011
	Amortized costs		Fair values		Amortized costs		Fair values
	($000 omitted)
Debt securities:
Municipal		20,313		21,247		26,721		27,801
Corporate and utilities		236,425		250,026		237,912		244,123
Foreign		161,871		163,637		162,384		164,268
U.S. Government		17,581		19,173		17,530		19,350
Equity securities		9,500		10,268		5,005		5,443
		445,690		464,351		449,552		460,985

Gross unrealized gains and losses

	June 30, 2012				December 31, 2011
	Gains		Losses		Gains		Losses
	($000 omitted)
Debt securities:
Municipal		934		—		1,080		—
Corporate and utilities		13,845		244		9,184		2,973
Foreign		1,930		164		1,937		53
U.S. Government		1,592		—		1,820		—
Equity securities		924		156		442		4
		19,225		564		14,463		3,030

Debt securities according to their contractual terms

	Amortized costs		Fair values
	($000 omitted)
In one year or less		37,520		37,764
After one year through five years		178,818		182,546
After five years through ten years		195,208		206,430
After ten years		24,644		27,343
		436,190		454,083

Gross unrealized losses on investments and the fair values of the related securities

	Less than 12 months				More than 12 months				Total
	Losses		Fair values		Losses		Fair values		Losses		Fair values
	($000 omitted)
Debt securities:
Municipal		—		400		—		—		—		400
Corporate and utilities		150		11,916		94		6,185		244		18,101
Foreign		164		64,573		—		—		164		64,573
U.S. Government		—		510		—		—		—		510
Equity securities		142		835		14		1,829		156		2,664
		456		78,234		108		8,014		564		86,248

	Less than 12 months				More than 12 months				Total
	Losses		Fair values		Losses		Fair values		Losses		Fair values
	($000 omitted)
Debt securities:
Corporate and utilities		1,944		42,851		1,029		24,830		2,973		67,681
Foreign		53		59,708		—		—		53		59,708
Equity securities		4		1,247		—		—		4		1,247
		2,001		103,806		1,029		24,830		3,030		128,636