Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Amounts included in Accumulated other comprehensive income, before tax

December 31,	2012		2011
(Dollars in thousands)
Net prior service costs	$	22,438	$	26,173
Net actuarial loss		(36,510)		(39,117)
	$	(14,072)	$	(12,944)

Amounts included in comprehensive income

Year Ended December 31, 2012	Before-Tax		Deferred Income Tax Benefit(Expense)		Net-of-Tax
(Dollars in thousands)
Net actuarial gains (losses)	$	90	$	(143)	$	(53)
Amortization of prior service costs		(3,735)		5,950		2,215
Amortization of actuarial losses		2,517		(4,010)		(1,493)
Total gains (losses) recognized in Comprehensive income	$	(1,128)	$	1,797	$	669
Year Ended December 31, 2011	Before-Tax		Deferred Income Tax Benefit(Expense)		Net-of-Tax
(Dollars in thousands)
Net actuarial gains (losses)	$	(9,625)	$	4,787	$	(4,838)
Amortization of prior service costs		(3,815)		1,897		(1,918)
Amortization of actuarial losses		1,934		(962)		972
Total gains (losses) recognized in Comprehensive income	$	(11,506)	$	5,722	$	(5,784)

Funded status of post-retirement benefit plans

December 31,		2012		2011
(Dollars in thousands)
Change in benefit obligation
	Benefit obligation at beginning of year	$	50,113	$	44,270
	Service cost		1,197		1,116
	Interest cost		2,297		2,368
	Actuarial (gain) loss		3,179		5,158
	Prescription drug subsidy		542		263
	Benefits paid		(2,760)		(3,062)
	Benefit obligation at end of year		54,568		50,113
Change in plan assets
	Fair value of plan assets at beginning of year		41,267		45,023
	Actual return (loss) on plan assets		6,264		(971)
	Employer contribution		276		277
	Benefits paid		(2,760)		(3,062)
	Fair value of plan assets at end of year		45,047		41,267
Funded status		$	(9,521)	$	(8,846)

Fair value of plan assets

December 31, 2012
(Dollars in thousands)		Level 1		Level 2		Level 3		Total
Mutual funds
	Bond	$	11,285	$	-	$	-	$	11,285
	International equity		8,868		-		-		8,868
	Money market		1,983		-		-		1,983
	US large cap		18,823		-		-		18,823
	US small cap		4,074		-		-		4,074
Other			-		-		14		14
Total plan assets at fair value		$	45,033	$	-	$	14	$	45,047
December 31, 2011
(Dollars in thousands)			Level 1		Level 2		Level 3		Total
Mutual funds
	Bond	$	10,098	$	-	$	-	$	10,098
	International equity		7,304		-		-		7,304
	Money market		2,031		-		-		2,031
	US large cap		18,100		-		-		18,100
	US small cap		3,723		-		-		3,723
Other			-		-		11		11
Total plan assets at fair value		$	41,256	$	-	$	11	$	41,267

Plan asset investment allocation

			Allocation of Plan Assets
			at December 31,
Investment	Target Asset
Category	Allocation		2012		2011
U.S. equities	50	%	50.8	%	52.9	%
International equities	20	%	19.7	%	17.7	%
Debt securities	30	%	29.5	%	29.4	%

Net periodic benefit cost

Net periodic benefit cost recorded in the Consolidated Statement of Operations includes the following components:
Year Ended December 31,		2012		2011		2010
(Dollars in thousands)
Service cost		$	1,197	$	1,116	$	1,175
Interest cost			2,297		2,368		2,325
Expected return on plan assets			(2,995)		(3,496)		(3,395)
Amortization of prior service costs (1)			(3,735)		(3,815)		(3,815)
Amortization of actuarial losses (2)			2,517		1,934		2,158
Net post-retirement cost		$	(719)	$	(1,893)	$	(1,552)
(1)	Based on straight-line amortization over the average time remaining before active employees become fully eligible for plan benefits.
(2)	Based on straight-line amortization over the average time remaining before active employees retire.

Assumptions used to calculate net periodic benefit cost

The following assumptions were used to determine benefit obligations and net periodic benefit cost:
December 31,	2012		2011
Benefit obligations
Discount rate	4.00	%	4.70	%
Net periodic benefit cost
Discount rate	4.70	%	5.50	%
Expected return on plan assets	7.50	%	8.00	%

Change in health care cost trend rate

	One Percent
	Increase		Decrease
(Dollars in thousands)
Effect on total service and interest cost components	$	14	$	(13)
Effect on post-retirement benefit obligation	$	323	$	(299)

Estimated future post-retirement benefit payments

	Estimated Future
	Post-Retirement
Year	Benefit Payments
(Dollars in thousands)
2013	$	2,291
2014		2,329
2015		2,289
2016		2,336
2017		2,286
2018-2022		13,710