Retirement Savings Plan (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Retirement Savings Plan [Abstract]
Age of employee to be covered under pension plan, minimum	21 years
Pretax salaries not to exceed the maximum IRC deferral amount	100.00%
Employer Discretionary Contribution Amount	$ 0	$ 0

Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration