Borrowings	3 Months Ended
Mar. 31, 2012
Debt Disclosure [Abstract]
Borrowings	Borrowings In February 2009, the Company entered into a credit agreement with Bank of America, N.A. (“Bank of America”), which provided for a one-year senior secured revolving credit facility in an amount of up to $180.0 million that is subject to a borrowing base formula. Subject to the terms of the credit agreement, including the amount of funds that the Company is permitted to borrow from time to time under the credit agreement, the revolving credit facility has a sub-limit for the issuance of letters of credit in a face amount of up to $10.0 million. Advances under the revolving credit facility were used to consummate the Company’s acquisition of Tepnel and are also available for other general corporate purposes. At the Company’s option, loans accrue interest at a per annum rate based on, either: the base rate (the base rate is defined as the greatest of (i) the federal funds rate plus a margin equal to 0.50%, (ii) Bank of America’s prime rate and (iii) the London Interbank Offered Rate (“LIBOR”) plus a margin equal to 1.00%); or LIBOR plus a margin equal to 0.60%, in each case for interest periods of 1, 2, 3 or 6 months as selected by the Company. In connection with the credit agreement, the Company also entered into a security agreement, pursuant to which the Company secured its obligations under the credit agreement with a first priority security interest in the securities, cash and other investment property held in specified accounts maintained by Merrill Lynch, Pierce, Fenner & Smith Incorporated, an affiliate of Bank of America. In March 2009, the Company and Bank of America amended the credit agreement to increase the amount that the Company may borrow from time to time under the credit agreement from $180.0 million to $250.0 million. The term of the credit facility with Bank of America has been extended three times and currently expires in February 2013. In June 2011, Bank of America issued a £1.2 million standby letter of credit on behalf of the Company, thereby reducing the amount the Company can borrow under the credit facility by the face amount of the letter of credit. The total principal amount outstanding under the revolving credit facility as of March 31, 2012 was $248.0 million, the interest rate payable on such outstanding amount was approximately 0.84% and no further borrowings are currently available under the credit facility.

Borrowings

In February 2009, the Company entered into a credit agreement with Bank of America, N.A. (“Bank of America”), which provided for a one-year senior secured revolving credit facility in an amount of up to $180.0 million that is subject to a borrowing base formula. Subject to the terms of the credit agreement, including the amount of funds that the Company is permitted to borrow from time to time under the credit agreement, the revolving credit facility has a sub-limit for the issuance of letters of credit in a face amount of up to $10.0 million. Advances under the revolving credit facility were used to consummate the Company’s acquisition of Tepnel and are also available for other general corporate purposes. At the Company’s option, loans accrue interest at a per annum rate based on, either: the base rate (the base rate is defined as the greatest of (i) the federal funds rate plus a margin equal to 0.50%, (ii) Bank of America’s prime rate and (iii) the London Interbank Offered Rate (“LIBOR”) plus a margin equal to 1.00%); or LIBOR plus a margin equal to 0.60%, in each case for interest periods of 1, 2, 3 or 6 months as selected by the Company. In connection with the credit agreement, the Company also entered into a security agreement, pursuant to which the Company secured its obligations under the credit agreement with a first priority security interest in the securities, cash and other investment property held in specified accounts maintained by Merrill Lynch, Pierce, Fenner & Smith Incorporated, an affiliate of Bank of America.

In March 2009, the Company and Bank of America amended the credit agreement to increase the amount that the Company may borrow from time to time under the credit agreement from $180.0 million to $250.0 million. The term of the credit facility with Bank of America has been extended three times and currently expires in February 2013. In June 2011, Bank of America issued a £1.2 million standby letter of credit on behalf of the Company, thereby reducing the amount the Company can borrow under the credit facility by the face amount of the letter of credit. The total principal amount outstanding under the revolving credit facility as of March 31, 2012 was $248.0 million, the interest rate payable on such outstanding amount was approximately 0.84% and no further borrowings are currently available under the credit facility.