Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Liabilities:
Revenue earnouts	$ 427	$ 738
Recurring basis | Quoted Prices in Active Markets (Level 1)
Assets:
Money market funds	4,004	35,929
Marketable equity securities	337	1,489
Total	4,341	37,418
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Currency forward derivatives/options	445
Total	445
Liabilities:
Currency forward derivatives/options		532
Total		532
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Springbox Revenue Sharing	768
Total	768
Liabilities:
Revenue earnouts	2,857	1,673
Total		1,673
Recurring basis | Total Fair Value Measurements
Assets:
Money market funds	4,004	35,929
Currency forward derivatives/options	445
Springbox Revenue Sharing	768
Marketable equity securities	337	1,489
Total	5,554	37,418
Liabilities:
Currency forward derivatives/options		532
Revenue earnouts	2,857	1,673
Total		$ 2,205