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Fair Value Measurement - Level 3 Liability (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Accounts payable and accrued expenses |  |
Fair Value, Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Short-term portion of deferred payments | $ 1,400 |
Deferred payments [Member] |  |
Schedule of changes in fair value of level 3 liability |  |
Balance at beginning of year | 11,741 | $ 3,278
Amounts paid | (1,133) | (7,358)
Contingent consideration in connection with NYCDA acquisition |  | 14,500
Other adjustments to fair value | (6,184) | 1,920
Balance at end of year | $ 4,424 | $ 12,340

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- Definition Amount of issuances 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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