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Stockholders' Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 6 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Feb. 28, 2013 Board of Directors [Member] | May 31, 2013 Restricted Stock [Member] | Mar. 31, 2013 Restricted Stock [Member] | Feb. 28, 2013 Restricted Stock [Member] | May 31, 2013 Restricted Stock [Member] Non-employee [Member] | Jun. 30, 2013 Stock Option [Member] | Feb. 28, 2013 Minimum [Member] Restricted Stock [Member] | Feb. 28, 2013 Maximum [Member] Restricted Stock [Member]
Stock Options and Restricted Stock (Textual) |  |  |  |  |  |  |  |  |  |  |
Shares approved for grants |  |  |  |  | 43,659 |  | 165,712 | 16,370 |  |  |
Vesting period, years |  |  |  | 2 years | 4 years |  |  | 3 years |  | 3 years | 5 years
Closing price of stock on date of stock grant |  |  |  |  |  |  | $ 62.28 | $ 45.81 |  |  |
Restricted shares converted to restricted stock units |  |  |  |  |  | 200,000 |  |  |  |  |
Options granted to purchase common stock |  |  |  | 100,000 |  |  |  |  |  |  |
Options granted to purchase common stock, exercise price |  |  |  | $ 51.95 |  |  |  |  |  |  |
Awards expiration period, years |  |  |  | 8 years |  |  |  |  |  |  |
Weighted average fair value of the options granted per share |  |  |  |  |  |  |  |  | $ 22.09 |  |
Stock options risk-free interest rate |  |  |  |  |  |  |  |  | 0.877% |  |
Stock options expected life |  |  |  |  |  |  |  |  | 5 years |  |
Stock options volatility rate |  |  |  |  |  |  |  |  | 48.49% |  |
Stock options dividend yield |  |  |  |  |  |  |  |  | 0.00% |  |
Common stock, shares authorized | 20,000,000 |  | 20,000,000 |  |  |  |  |  |  |  |
Common stock, par value | $ 0.01 |  | $ 0.01 |  |  |  |  |  |  |  |
Common stock, shares issued | 10,870,468 |  | 11,387,299 |  |  |  |  |  |  |  |
Common stock, shares outstanding | 10,870,468 |  | 11,387,299 |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 8,000,000 |  | 8,000,000 |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  |  |
Annual cash dividends per share |  |  | $ 4.00 |  |  |  |  |  |  |  |
Quarterly cash dividends per share |  |  | $ 1.00 |  |  |  |  |  |  |  |
Maximum term of the awards granted under the Plan | 10 years |  |  |  |  |  |  |  |  |  |
Stock-based compensation cost which has not yet been recognized | $ 43.7 |  |  |  |  |  |  |  |  |  |
Stock-based compensation cost recognized period, in months | 57 months |  |  |  |  |  |  |  |  |  |
Tax shortfall related to share-based payment arrangements | $ 3.5 | $ 0.4 |  |  |  |  |  |  |  |  |
Restricted stock awarded subject to performance condition | 344,000 |  |  |  |  |  |  |  |  |  |

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