Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance on accounts receivable	$ 253	$ 200
Property and equipment, accumulated depreciation	$ 33,046	$ 31,378
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	52,516,219	52,725,247
Common stock, shares outstanding	52,516,219	52,725,247
Treasury stock, shares	18,139,958	16,412,755