Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Accounts receivable, net of allowances	$ 1,476	$ 1,461
Property and equipment, net of accumulated depreciation	$ 20,108	$ 13,303
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	34,371	30,707
Common stock, shares outstanding	34,371	30,707