Business Segment and Geographic Data, Revenue by Geographical Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Net revenues by geographic area [Abstract]
Revenues	$ 52,120		$ 58,065		$ 102,195		$ 115,281
Reportable Geographical Components [Member]
Net revenues by geographic area [Abstract]
Revenues	52,120		58,065		102,195		115,281
Long-lived assets by geographic area [Abstract]
Long-lived assets	29,138				29,138				10,489
Reportable Geographical Components [Member] | North America [Member]
Net revenues by geographic area [Abstract]
Revenues	41,803	[1]	42,033	[1]	81,776	[1]	86,932	[1]
Long-lived assets by geographic area [Abstract]
Long-lived assets	27,859				27,859				9,119
Reportable Geographical Components [Member] | Asia Pacific [Member]
Net revenues by geographic area [Abstract]
Revenues	2,638	[2]	9,440	[2]	5,014	[2]	15,202	[2]
Long-lived assets by geographic area [Abstract]
Long-lived assets	4				4				0
Reportable Geographical Components [Member] | Europe (Including Israel) [Member]
Net revenues by geographic area [Abstract]
Revenues	7,084		5,861		14,492		11,494
Long-lived assets by geographic area [Abstract]
Long-lived assets	1,270				1,270				1,370
Reportable Geographical Components [Member] | South America [Member]
Net revenues by geographic area [Abstract]
Revenues	595		731		912		1,653
Long-lived assets by geographic area [Abstract]
Long-lived assets	5				5				0
Reportable Geographical Components [Member] | United States [Member]
Net revenues by geographic area [Abstract]
Revenues	38,612		37,329		73,379		75,336
Reportable Geographical Components [Member] | Canada [Member]
Net revenues by geographic area [Abstract]
Revenues	3,191		4,704		8,397		11,596
Reportable Geographical Components [Member] | Japan [Member]
Net revenues by geographic area [Abstract]
Revenues	$ 290		$ 7,452		$ 988		$ 11,715

[1] United States $38,612 $37,329 $73,379 $75,336 Canada $3,191 $4,704 $8,397 $11,596

[2] Japan $290 $7,452 $988 $11,715