Business Combinations (Consideration Transferred) (Details) (RelateIQ, Inc. [Member], USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended
Aug. 14, 2014
Business Acquisition [Line Items]
Cash	$ 1,123
Fair value of stock options and restricted stock awards assumed	1,050
Consideration transferred	340,206
Common Stock [Member]
Business Acquisition [Line Items]
Common stock (6,320,735 shares)	$ 338,033
Shares issued	6,320,735

Number of shares of equity interests issued or issuable to acquire entity.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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