Business Acquisitions (Details) - USD ($) $ in Thousands				12 Months Ended
	Oct. 01, 2015	Mar. 26, 2014	Mar. 10, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Cash paid for acquisitions and investments				$ 8,147	$ 9,725	$ 1,900
GigMasters.com [Member]
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	28.70%
Cash paid for acquisitions and investments	$ 6,100
Business Combination, Percent Acquired	71.30%
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination	$ 7,868
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Tangible Assets	500
Finite-Lived Intangible Assets	$ 3,700
Two Bright Lights, Inc.
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets				$ 6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets		$ 100
Finite-Lived Intangible Assets		1,700
Consideration transferred		$ 5,300
Gojee, Inc. [Member]
Business Acquisition [Line Items]
Consideration transferred			$ 500