Stock Options (Performance Conditions Options Narrative) (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Expense	$ 3,000,000	$ 1,900,000
Performance Condition Options
Description of award	During the year ended December 31, 2010, the Company's Board of Directors awarded a total of 1,130,700 performance condition options to certain of the Company's employees. Vesting of these options is subject to the Company achieving certain performance criteria established at the grant date and the individuals fulfilling a service condition (continued employment). As of March 31, 2013, the performance criteria of 825,340 of these options had been satisfied and will become exercisable based on the following vesting schedule: 25% on each of the first four anniversaries of the date of grant, which was February 20, 2010 (the date of grant). The Company recognized $161,000 and $284,000 of compensation expense during the three months ended March 31, 2013 and 2012, respectively, related to these options. The next performance criteria could be met within the next six months and would trigger approximately $90,000 of compensation expense related to these options. The Company utilized the Black-Scholes option pricing model to determine the grant date fair value of these awards. As of March 31, 2013, except for the 825,340 options discussed above, the Company does not believe that the achievement of the remaining performance criteria is probable and therefore, has not recognized any compensation expense related to these options during the three months ended March 31, 2013 and 2012, respectively. Compensation expense will be recognized only once the performance condition is probable of being achieved and then only the cumulative amount related to the service condition that has been fulfilled.
Share-based Compensation Expense	$ 161,000	$ 284,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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