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Employee Benefit Plan - Summary of Assumptions Used (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Discount rate	4.15%	3.19%	3.27%	4.19%
Expected long term rate on plan assets	0.00%	4.75%	4.75%	5.00%
Rate of compensation increase		3.75%		3.75%

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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