401k Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
401k Plan [Abstract]
Minimum age require to qualify for pension plan	21 years
Minimum service period require to qualify for pension plan	3 months
Maximum wages deferred (in hundredths)	100.00%
Maximum eligible wages deferred by participants per year	$ 17,000
Minimum age for additional contribution beyond normal plan	50 years
Defined benefit plan, contributions by plan participants	$ 5,500
Employer matching contribution (in hundredths)	6.00%