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Goodwill, Customer Relationships and Trademarks - Roll Forward (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 18,379,000 | [1] | $ 0 |  | $ 0
Balance at end of period | 79,147,000 | [1] | 18,379,000 | [1] | 0
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Additions | 0 |  | 0 |  | 0
Amortization expense | 0 |  | 0 |  | 0
Balance at end of period | 39,862 |  |  |  |
Customer Relationships— Acquired & Non-Compete Agreements |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Balance at beginning of period | 10,380,000 |  | 0 |  | 0
Additions | 0 |  | 0 |  | 0
Amortization expense | (27,157,000) |  | (4,503,000) |  | 0
Balance at end of period | 31,911,000 |  | 10,380,000 |  | 0
Customer Relationships— Other |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Balance at beginning of period | 3,049,000 |  | 1,501,000 |  | 0
Additions | 0 |  | 2,731,000 |  | 1,589,000
Amortization expense | (1,437,000) |  | (1,183,000) |  | (88,000)
Balance at end of period | 1,612,000 |  | 3,049,000 |  | 1,501,000
Trademarks |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Balance at beginning of period | 1,194,000 |  | 0 |  | 0
Additions | 0 |  | 0 |  | 0
Amortization expense | (357,000) |  | (74,000) |  | 0
Balance at end of period | 6,339,000 |  | 1,194,000 |  | 0
Customer Relationships |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Amortization expense | (28,600,000) |  | (5,700,000) |  | $ (100,000)
Cost of Revenue | Customer Relationships |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Amortization expense | (15,800,000) |  |  |  |
CenStar |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period | 6,396,000 |  |  |  |
Acquisitions |  |  | 6,396,000 |  |
Balance at end of period |  |  | 6,396,000 |  |
CenStar | Customer Relationships— Acquired & Non-Compete Agreements |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Acquisitions |  |  | 5,494,000 |  |
CenStar | Customer Relationships— Other |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Acquisitions |  |  | 0 |  |
CenStar | Trademarks |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Acquisitions |  |  | 651,000 |  |
Oasis |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Acquisitions |  |  | 11,983,000 |  |
Oasis | Customer Relationships— Acquired & Non-Compete Agreements |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Acquisitions |  |  | 9,389,000 |  |
Oasis | Customer Relationships— Other |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Acquisitions |  |  | 0 |  |
Oasis | Trademarks |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Acquisitions |  |  | $ 617,000 |  |
Provider Companies |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Acquisitions | 26,040,000 |  |  |  |
Balance at end of period | 26,040,000 |  |  |  |
Provider Companies | Customer Relationships— Other |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Acquisitions | 0 |  |  |  |
Major Energy Companies |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Acquisitions | 34,728,000 |  |  |  |
Major Energy Companies | Customer Relationships— Other |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Acquisitions | $ 0 |  |  |  |
[1] | See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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