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Defined Pension Plans (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension period			30 years
Defined Benefit Pension Plan [Member]
Pension costs	$ 923	$ 665	$ 1,858	$ 1,330
Pension contribution	500		1,000
Unfunded Supplemental Executive Retirement Plan [Member]
Pension costs	$ 255	$ 223	$ 515	$ 447

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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