Employee Benefit Plans (Details) (401(k) Employee Savings and Profit Sharing Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
401(k) Employee Savings and Profit Sharing Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Requisite service period	1 year
Company's contribution to the plan	$ 1,539	$ 1,452	$ 1,497