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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Measurements of Assets and Liabilities |
Schedule of assets and liabilities held and their related classifications under the fair value hierarchy | The following is a summary of assets, liabilities and redeemable noncontrolling interests and their related classifications under the fair value hierarchy:
| December 31, 2017
| Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash (1) | $ | 246,125 |  |  | $ | 246,125 |  |  | $ | — |  |  | $ | — |
Marketable securities-short term (2) | 3,111 |  |  | — |  |  | 3,111 |  |  | — |
Total assets | $ | 249,236 |  |  | $ | 246,125 |  |  | $ | 3,111 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Contingent interest derivative (3) | 193 |  |  |  |  |  |  | 193 |
Mandatorily redeemable financial instrument (4) | 37,959 |  |  |  |  |  |  | 37,959 |
Total liabilities | $ | 38,152 |  |  | $ | — |  |  | $ | — |  |  | $ | 38,152 |
Temporary Equity |  |  |  |  |  |  |
Redeemable noncontrolling interests (4) | $ | 25,280 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,280 |
Total temporary equity | $ | 25,280 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,280 |
| December 31, 2016
(Restated) | Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash (1) | $ | 211,433 |  |  | $ | 211,433 |  |  | $ | — |  |  | $ | — |
Marketable securities-short term (2) | 12,506 |  |  | — |  |  | 12,506 |  |  | — |
Marketable securities-long term (2) | 2,974 |  |  | — |  |  | 2,974 |  |  | — |
Total assets | $ | 226,913 |  |  | $ | 211,433 |  |  | $ | 15,480 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Contingent consideration obligation | $ | 2,833 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,833 |
Total liabilities | $ | 2,833 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,833 |
Temporary Equity |  |  |  |  |  |  |
Redeemable noncontrolling interests (5) | $ | 25,280 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,280 |
Total temporary equity | $ | 25,280 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,280 |
(1) | Cash equivalents primarily include money market funds
(2) | Comprised of municipal bonds and certificates of deposit
(3) | Contingent interest derivative related to convertible debt is included in accrued expenses, for further details see Note 11 - Debt.
(4) | Mandatorily redeemable financial instruments comprise of the Company’s contractual obligation to deliver a set number of preferred shares at a time in less than twelve months and the option for the Company to receive a set number of common shares
(5) | Put arrangements held by the noncontrolling interests in certain of the Company’s joint ventures
Schedule of estimated fair value of investments classified as available for sale | At December 31, 2017 and December 31, 2016, the estimated fair value of investments classified as available for sale, are as follows:
| December 31, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Marketable securities: |  |  |  |  |  |  |
Certificates of deposit | $ | 250 |  |  | $ | — |  |  | $ | — |  |  | $ | 250 |
Municipal bonds | 2,867 |  |  | — |  |  | (6 | ) |  | 2,861 |
Total marketable securities | $ | 3,117 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 3,111 |
As of December 31, 2017, an insignificant amount of accumulated unrealized losses related to investments that have been in a continuous unrealized loss position for 12 months or longer. The aggregate related fair value of investment with unrealized losses was approximately $2.9 million.
| December 31, 2016
| (Restated)
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Marketable securities: |  |  |  |  |  |  |
Certificates of deposit | $ | 450 |  |  | $ | — |  |  | $ | — |  |  | $ | 450 |
Municipal bonds | 15,063 |  |  | 1 |  |  | (34 | ) |  | 15,030 |
Total marketable securities | $ | 15,513 |  |  | $ | 1 |  |  | $ | (34 | ) |  | $ | 15,480 |
Expected maturities of available-for-sale securities | Contractual maturities of marketable debt securities are as follows:
| December 31, 2017
| Amortized Cost |  | Fair Value
Due within one year | $ | 3,117 |  |  | $ | 3,111 |
Due after 1 year through 5 years | — |  |  | — |
Total available-for-sale securities | $ | 3,117 |  |  | $ | 3,111 |
Redeemable Noncontrolling Interests |
Fair Value Measurements of Assets and Liabilities |
Schedule of changes in fair value of Level 3 | The changes in redeemable noncontrolling interests classified as Level 3 measurements were as follows:
Balance at December 31, 2016 | $ | 25,280 |
Fair value and other adjustments | 9,291 |
Net loss attributable to interests in subsidiaries | (9,291 | )
Balance at December 31, 2017 | $ | 25,280 |
Contingent Consideration Obligation |
Fair Value Measurements of Assets and Liabilities |
Schedule of changes in fair value of Level 3 | The changes in fair value of the Company’s Level 3 contingent consideration obligation during the year ended December 31, 2017 were as follows:
Balance at December 31, 2016, as restated | $ | 2,833 |
Payment of contingent consideration | (2,831 | )
Other adjustments to contingent consideration obligation included in net income | (2 | )
Balance at December 31, 2017 | $ | — |

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