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Employee Benefit Plans - Summary of weighted average assumptions used to determine projected benefit obligation and net benefit cost (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Projected Benefit Obligation:
Discount rate	4.16%	5.00%	5.49%
Rate of compensation increase
Net Benefit Cost:
Discount rate	5.00%	5.49%	6.00%
Expected return on plan assets	7.00%	7.00%	7.00%
Rate of compensation increase

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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