Stock and Incentive Compensation Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Compensation expense - Stock and Incentive plans [Abstract]
Compensation expense - Stock and Incentive plans	$ 852	$ 1,014	$ 1,874	$ 2,141
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)	166,716		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
Forfeited (in shares)	(6,196)		(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	187	229	398	448
Time Vested Award [Member]
Stock and incentive plan [Roll Forward]
Outstanding/Nonvested shares or units, beginning of period (in shares)	344,956		317,573
Granted (in shares)	13,400		100,355
Granted - excess shares (in shares)	0		10,809
Exercised or released from restriction (in shares)	(1,460)		(67,916)
Expired (in shares)	0		0
Forfeited (in shares)	(8,645)		(12,570)
Outstanding/Nonvested shares or units, end of period (in shares)	348,251		348,251
Compensation expense - Stock and Incentive plans [Abstract]
Compensation expense - Stock and Incentive plans	$ 665	$ 785	$ 1,476	$ 1,693
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)	673,300		699,600
Granted (in shares)	0		0
Granted - excess shares (in shares)	0		0
Exercised or released from restriction (in shares)	(4,000)		(15,800)
Expired (in shares)	(379,600)		(394,100)
Forfeited (in shares)	0		0
Outstanding/Nonvested shares or units, end of period (in shares)	289,700		289,700
2005 Stock and Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, vesting percentage per year (in hundredths)			20.00%
Stock and incentive compensation plan, contractual term			7 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