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Acquisitions - Manatee Works Inc. Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 21, 2015
Business Acquisition [Line Items]
Goodwill	$ 113,208	$ 95,280	$ 81,448
Manatee Works, Inc. [Member]
Business Acquisition [Line Items]
Prepaid expenses and other current assets				$ 23
Goodwill				4,060
Purchase price				4,813
Customer Relationships [Member] | Manatee Works, Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets				140
Technology-Based Intangible Assets [Member] | Manatee Works, Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets				$ 590

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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