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401(k) savings plan	12 Months Ended
401(k) savings plan	Dec. 31, 2012
401(k) savings plan [Abstract]
401(k) savings plan	16. 401(k) savings plan The Company has established a defined contribution savings plan under Section 401(k) of the Internal Revenue Code. The 401(k) Plan covers substantially all employees. Under the 401(k) Plan, employees may make elective salary deferrals. The Company currently provides for matching of qualified deferrals up to 50% of the first 6% of the employee's salary. During the years ended December 31, 2012, 2011 and 2010, the Company made matching contributions of approximately $1.9 million, $1.8 million and $1.3 million, respectively.

The entire disclosure for pension and other postretirement benefits.

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