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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Statement Of Financial Position [Abstract] |  |
Accounts receivable, net of allowance for doubtful accounts | $ 1,009 | $ 627
Property and equipment, net of accumulated depreciation | 63,680 | 59,702
Intangible assets, net of accumulated amortization | $ 12,478 | $ 11,951
Preferred stock, par value | $ 0.001 | $ 0.001
Preferred stock, shares authorized | 2,000 | 2,000
Preferred stock, shares outstanding |  |
Common stock, par value | $ 0.001 | $ 0.001
Common stock, shares authorized | 50,000 | 50,000
Common stock, shares issued | 33,957 | 33,655
Common stock, shares outstanding | 33,957 | 33,655
Treasury stock, shares | 2,436 | 2,436

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