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Summary of Significant Accounting Policies (Details Textual) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 Customer | Dec. 31, 2011 | Dec. 31, 2010
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Major customer revenue | 1 billion-plus |  |
Original maturities | 90 days |  |
Number of customers accounted for revenues or accounts receivable greater than 2% of total | 0 |  |
Percentage of revenue represent by single customer maximum threshold | 2.00% |  |
Annual goodwill impairment test, period | November 30 |  |
Non-current deferred rent liabilities | $ 6,936,000 | $ 6,671,000 |
Foreign exchange losses | 400,000 | 1,300,000 | 1,400,000
Remeasurement gains on deferred tax liability | 100,000 | 100,000 | 400,000
Special dividend declared per common share |  |  | $ 3.00
Unamortized fair value stock based compensation | 9,000,000 |  |
Weighted average remaining recognition period | 1 year 10 months 24 days |  |
Indefinite-lived intangible assets | $ 0 |  |
Stock Options [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Options to purchase shares | 0.8 | 0.3 | 0.4

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