Marketable Securities and Fair Value Disclosures (Details 1) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Financial assets:
Available-for-Sale Securities	$ 9,677	$ 10,130
Fair Value Measurements, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Financial assets:
Bank time deposits	0	0
Foreign exchange option contracts, net	0	0
Indemnification assets acquired	977	1,078
Total	2,267	2,347
Financial liabilities:
Foreign exchange option contracts, net	0	0
Contingent consideration liability associated with acquisition	14,962
Financial liabilities	16,687	1,650
Fair Value Measurements, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member] \| Auction rate securities [Member]
Financial assets:
Available-for-Sale Securities	1,290	1,269
Fair Value Measurements, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member] \| Money market fund deposits [Member]
Financial assets:
Available-for-Sale Securities	0	0
Fair Value Measurements, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member] \| Mutual funds [Member]
Financial assets:
Available-for-Sale Securities	0	0
Fair Value Measurements, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member] \| Other long-term liabilities acquired [Member]
Financial liabilities:
Financial liabilities	1,494	1,419
Fair Value Measurements, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member] \| Deferred consideration acquired [Member]
Financial liabilities:
Financial liabilities	231	231
Fair Value, Measurements, Recurring [Member]
Financial assets:
Bank time deposits	68,939	65,646
Foreign exchange option contracts, net	354	133
Indemnification assets acquired	977	1,078
Total	82,016	104,690
Financial liabilities:
Foreign exchange option contracts, net	563	0
Contingent consideration liability associated with acquisition	14,962
Financial liabilities	17,250	1,650
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial assets:
Bank time deposits	0	0
Foreign exchange option contracts, net	0	0
Indemnification assets acquired	0	0
Total	10,456	36,564
Financial liabilities:
Foreign exchange option contracts, net	0	0
Contingent consideration liability associated with acquisition	0
Financial liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Auction rate securities [Member]
Financial assets:
Available-for-Sale Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Money market fund deposits [Member]
Financial assets:
Available-for-Sale Securities	2,069	27,703
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Mutual funds [Member]
Financial assets:
Available-for-Sale Securities	8,387	8,861
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other long-term liabilities acquired [Member]
Financial liabilities:
Financial liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Deferred consideration acquired [Member]
Financial liabilities:
Financial liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial assets:
Bank time deposits	68,939	65,646
Foreign exchange option contracts, net	354	133
Indemnification assets acquired	0	0
Total	69,293	65,779
Financial liabilities:
Foreign exchange option contracts, net	563	0
Contingent consideration liability associated with acquisition	0
Financial liabilities	563	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Auction rate securities [Member]
Financial assets:
Available-for-Sale Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Money market fund deposits [Member]
Financial assets:
Available-for-Sale Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Mutual funds [Member]
Financial assets:
Available-for-Sale Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other long-term liabilities acquired [Member]
Financial liabilities:
Financial liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Deferred consideration acquired [Member]
Financial liabilities:
Financial liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Auction rate securities [Member]
Financial assets:
Available-for-Sale Securities	1,290	1,269
Fair Value, Measurements, Recurring [Member] \| Money market fund deposits [Member]
Financial assets:
Available-for-Sale Securities	2,069	27,703
Fair Value, Measurements, Recurring [Member] \| Mutual funds [Member]
Financial assets:
Available-for-Sale Securities	8,387	8,861
Fair Value, Measurements, Recurring [Member] \| Other long-term liabilities acquired [Member]
Financial liabilities:
Financial liabilities	1,494	1,419
Fair Value, Measurements, Recurring [Member] \| Deferred consideration acquired [Member]
Financial liabilities:
Financial liabilities	$ 231	$ 231

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