Goodwill and Other Intangible Assets, Net (Protocol Acquisition) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired intangible assets, Net carrying amount	$ 224,148	$ 155,275
Goodwill	$ 615,438	$ 493,890	$ 490,196