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Fair Value Measurements - Fair Value Measurements Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Change in Fair Value of Earnout Liabilities | $ 1,936 | $ 1,000
Accretion Related To Earnouts |  | $ 0
Provider Earnout |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Accretion Related To Earnouts | 100 |
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent payment arrangement, beginning | 22,653 |
Contingent payment arrangement, ending | 16,186 |
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent payment arrangement, beginning | 22,653 |
Purchase price contingent consideration | 0 |
Change in Fair Value of Earnout Liabilities | 711 |
Accretion Related To Earnouts | 1,225 |
Business Combination, Contingent Consideration Arrangements, Settlement | (8,403) |
Contingent payment arrangement, ending | 16,186 |
Fair Value, Measurements, Recurring | Level 3 | Major Earnout And Stock Earnout [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent payment arrangement, beginning | 17,760 |
Purchase price contingent consideration | 0 |
Change in Fair Value of Earnout Liabilities | 711 |
Accretion Related To Earnouts | 1,167 |
Business Combination, Contingent Consideration Arrangements, Settlement | (7,403) |
Contingent payment arrangement, ending | 12,235 |
Fair Value, Measurements, Recurring | Level 3 | Provider Earnout |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent payment arrangement, beginning | 4,893 |
Purchase price contingent consideration | 0 |
Change in Fair Value of Earnout Liabilities | 0 |
Accretion Related To Earnouts | 58 |
Business Combination, Contingent Consideration Arrangements, Settlement | $ (1,000) |

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