Acquisitions (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended					3 Months Ended
	Dec. 02, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Latista [Member]	Dec. 31, 2013 Latista [Member]	Dec. 02, 2013 Latista [Member]	Mar. 31, 2014 Latista [Member] Trademarks [Member]	Mar. 31, 2014 Latista [Member] Technology [Member]	Mar. 31, 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
Long-term deferred tax assets				946	946
Long-term deferred tax liabilities				1,727	1,727
Revenue from acquisition				674
Net loss from acquisition				$ 1,695
Net loss per share, basic and diluted		$ 0.30	$ 0.56	$ 0.07
Intangible assets acquired, useful life							3 years	3 years	10 years