Accrued And Other Liabilities (Schedule Of Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accrued And Other Liabilities [Abstract]
Compensation and benefits	$ 16,786	$ 13,582
Vendor accruals	3,929	3,357
Accrued professional fees	482	533
Accrued taxes	3,243	3,382
Royalties payable	573	550
Accrued interest	783	266
Earnouts and deferred payments related to acquisitions	2,657	2,657
Accrued other	804	462
Total	$ 29,257	$ 24,789