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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

X

- 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

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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
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-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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

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Fair value 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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-Subparagraph (c)
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