Business Segment and Geographic Data, Revenue by Geographical Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net revenues by geographic area [Abstract]
Revenues	$ 63,490	$ 45,893	$ 58,065	$ 57,216	$ 54,791	$ 56,681	$ 58,906	$ 50,273	$ 28,749	$ 34,745	$ 33,847	$ 34,741	$ 224,664	$ 220,651	$ 132,082
Long-lived assets by geographic area [Abstract]
Long-lived assets	10,489				6,759				5,324				10,489	6,759	5,324
North America [Member]
Net revenues by geographic area [Abstract]
Revenues													174,850	163,973	91,821
Long-lived assets by geographic area [Abstract]
Long-lived assets	9,119				5,772				4,496				9,119	5,772	4,496
Asia Pacific [Member]
Net revenues by geographic area [Abstract]
Revenues													19,081	28,031	28,213
Long-lived assets by geographic area [Abstract]
Long-lived assets	0				0				0				0	0	0
Europe (Including Israel) [Member]
Net revenues by geographic area [Abstract]
Revenues													27,849	25,521	9,994
Long-lived assets by geographic area [Abstract]
Long-lived assets	1,370				987				828				1,370	987	828
South America [Member]
Net revenues by geographic area [Abstract]
Revenues													2,884	3,126	2,054
Long-lived assets by geographic area [Abstract]
Long-lived assets	0				0				0				0	0	0
United States [Member]
Net revenues by geographic area [Abstract]
Revenues													112,635	135,950	75,341
Canada [Member]
Net revenues by geographic area [Abstract]
Revenues													62,215	28,023	16,480
Japan [Member]
Net revenues by geographic area [Abstract]
Revenues													$ 11,556	$ 21,134	$ 25,924