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Fair Value Measurements - Level 3 Contingent Consideration (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in fair value of the Company's Level 3 contingent consideration obligation |  |  |  |  |  |  |  |
Other adjustments to contingent consideration obligation included in net income | $ (572) | $ (1,349) | $ 3,110 | $ 5 | $ 1,515 | $ 0 | $ 1,194 | $ 1,515
Level 3 | Contingent Consideration Obligation |  |  |  |  |  |  |  |
Level 3 changes |  |  |  |  |  |  |  |
Long-term revenue growth rate |  |  |  |  |  | 2.19% |  |
Changes in fair value of the Company's Level 3 contingent consideration obligation |  |  |  |  |  |  |  |
Balance as at the beginning of the period |  |  |  |  |  | $ 2,833 |  |
Payment of contingent consideration |  |  |  |  |  | (2,831) |  |
Other adjustments to contingent consideration obligation included in net income |  |  |  |  |  | (2) |  |
Balance as at the end of the period | $ 2,833 |  |  |  |  | 0 | $ 2,833 |
Razorsight Corporation | Contingent Consideration Obligation |  |  |  |  |  |  |  |
Changes in fair value of the Company's Level 3 contingent consideration obligation |  |  |  |  |  |  |  |
Payment of contingent consideration |  |  |  |  |  | $ 2,800 |  |

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition Percentage of assumed long-term growth in revenues, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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