Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes (Textual) [Abstract]
Provision for income taxes	$ (13,887,000)	$ (9,834,000)	$ (38,393,000)	$ (27,658,000)
Effective tax rate	39.50%	39.10%	39.70%	38.90%
Provision for federal income taxes rate	32.70%	32.80%	32.70%	32.80%
Net benefit for state taxes rate	2.30%	2.20%	2.30%	2.20%
Blended provision for state taxes rate	6.50%	6.20%	6.50%	6.20%
Net provision for permanent book versus tax differences rate		0.10%		0.10%
Net expenses for state and federal tax accounts	0.30%		0.50%
Income Tax Holiday, Description			The Company’s subsidiary in Costa Rica is operating under a 100% tax holiday for the next eight years and a 50% tax holiday for the subsequent four years.  The impact of the tax holiday in Costa Rica for the three and six months ended June 30, 2012 was immaterial.
Unrecognized tax benefit	1,500,000		1,500,000
Net tax benefit from unrecognized tax benefits, if recognized	900,000		900,000
Undistributed earnings	2,100,000		5,800,000
Reduction in gross unrecognized tax benefit	$ 400,000		$ 400,000