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Pensions (Narrative) (Details) (USD $)	12 Months Ended
Pensions (Narrative) (Details) (USD $)	Dec. 31, 2012	Sep. 30, 2013
Pensions [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments, Remainder of Fiscal Year		$ 560,000
Pension Expense	1,100,000
Defined Benefit Plan, Contributions by Employer	6,800,000
Defined Benefit Plan, Contributions by Employer, Excess Cash Contributed	$ 6,000,000

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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