Acquisitions (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended			6 Months Ended
	Dec. 02, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Latista [Member]	Jun. 30, 2014 Latista [Member]	Dec. 31, 2013 Latista [Member]	Dec. 02, 2013 Latista [Member]	Jun. 30, 2014 Latista [Member] Trademarks [Member]	Jun. 30, 2014 Latista [Member] Technology [Member]	Jun. 30, 2014 Latista [Member] Customer Relationships [Member]
Business Acquisition [Line Items]
Aggregate purchase price paid in cash	$ 34,875
Deferred tax liabilities									1,083
Tax benefit								1,083
Short-term deferred tax assets						781	781	781
Long-term deferred tax assets						946	946	946
Long-term deferred tax liabilities						1,727	1,727	1,727
Revenue from acquisition						703	1
Net loss from acquisition						$ 1,396	$ 3
Net loss per share, basic and diluted		$ 0.24	$ 2.31	$ 0.54	$ 3.09	$ 0.06	$ 0.12
Intangible assets acquired, useful life										3 years	3 years	10 years