Long Term Liabilities (Schedule of Long Term Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Long Term Liabilities [Abstract]
Indemnification liabilities	$ 11,500	$ 6,079
Deferred tax liability	3,365	4,907
Liabilities for uncertain tax positions	80,006	79,688	81,179	80,732
Other	305	2,443
Long term liabilities	$ 95,176	$ 93,117