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Goodwill, Customer Relationships and Trademarks - Goodwill and Intangible Assets (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |
Goodwill | $ 79,147,000 | [1] | $ 18,379,000 | [1] | $ 0 | $ 0
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Total | 39,862 |  |  |  |  |
Customer Relationships— Acquired & Non-Compete Agreements |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Cost | 63,571,000 |  | 14,883,000 |  |  |
Accumulated amortization | (31,660,000) |  | (4,503,000) |  |  |
Total | 31,911,000 |  | 10,380,000 |  | 0 | 0
Customer Relationships— Other |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Cost | 4,320,000 |  | 4,320,000 |  |  |
Accumulated amortization | (2,708,000) |  | (1,271,000) |  |  |
Total | 1,612,000 |  | 3,049,000 |  | 1,501,000 | 0
Trademarks |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Cost | 6,770,000 |  | 1,268,000 |  |  |
Accumulated amortization | (431,000) |  | (74,000) |  |  |
Total | $ 6,339,000 |  | $ 1,194,000 |  | $ 0 | $ 0
[1] | See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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