Stock and Incentive Compensation Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Compensation expense - Stock and Incentive plans [Abstract]
Compensation expense - Stock and Incentive plans	$ 976	$ 978	$ 2,850	$ 3,119
Performance Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ROATE Performance measure (in hundredths)			100.00%
TSR Performance measure (in hundredths)			100.00%
Stock and incentive plan [Roll Forward]
Outstanding/Nonvested shares or units, beginning of period (in shares)	160,520		159,583
Granted (in shares)	0		62,119
Granted - excess shares (in shares)	0		0
Exercised or released from restriction (in shares)	0		(54,784)
Expired (in shares)	0		0
Forfeited (in shares)	0		(6,398)
Outstanding/Nonvested shares or units, end of period (in shares)	160,520		160,520
Compensation expense - Stock and Incentive plans [Abstract]
Compensation expense - Stock and Incentive plans	222	229	620	677
Time Vested Award [Member]
Stock and incentive plan [Roll Forward]
Outstanding/Nonvested shares or units, beginning of period (in shares)	348,251		317,573
Granted (in shares)	1,800		102,155
Granted - excess shares (in shares)	0		10,809
Exercised or released from restriction (in shares)	(1,044)		(68,960)
Expired (in shares)	0		0
Forfeited (in shares)	(2,181)		(14,751)
Outstanding/Nonvested shares or units, end of period (in shares)	346,826		346,826
Compensation expense - Stock and Incentive plans [Abstract]
Compensation expense - Stock and Incentive plans	$ 754	$ 749	$ 2,230	$ 2,442
Restricted Stock [Member] | Performance Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Restricted Stock [Member] | Time Vested Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Stock option-based awards [Member]
Stock and incentive plan [Roll Forward]
Outstanding/Nonvested shares or units, beginning of period (in shares)	289,700		699,600
Granted (in shares)	0		0
Granted - excess shares (in shares)	0		0
Exercised or released from restriction (in shares)	(17,500)		(33,300)
Expired (in shares)	(10,000)		(404,100)
Forfeited (in shares)	0		0
Outstanding/Nonvested shares or units, end of period (in shares)	262,200		262,200
2005 Stock and Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock and incentive compensation plan, contractual term			7 years
Vesting period			5 years
1997 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock and incentive compensation plan, contractual term			10 years
Vesting period			4 years