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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Intangible assets |  |  |  |
Weighted Average Life |  | 15 years |  |
Gross Carrying Amount |  | $ 130,965 | $ 84,250 |
Accumulated Amortization |  | (49,767) | (39,450) |
Amortization expense of intangible assets |  | 11,302 | 8,689 | $ 6,597
Estimated future amortization expense for intangible assets |  |  |  |
2019 |  | 11,559 |  |
2020 |  | 8,814 |  |
2021 |  | 7,577 |  |
2022 |  | 6,416 |  |
2023 |  | 5,394 |  |
Thereafter |  | 41,438 |  |
Total |  | $ 81,198 | 44,800 |
Tradename |  |  |  |
Intangible assets |  |  |  |
Weighted Average Life |  | 9 years |  |
Gross Carrying Amount |  | $ 31,390 | 32,175 |
Accumulated Amortization |  | (25,156) | (22,238) |
Estimated future amortization expense for intangible assets |  |  |  |
Total |  | $ 6,234 | 9,937 |
Tradename | Pipeline | Selling, general and administrative expenses |  |  |  |
Intangible assets |  |  |  |
Impairment of intangible asset | $ 500 |  |  |
Customer relationships |  |  |  |
Intangible assets |  |  |  |
Weighted Average Life |  | 16 years |  |
Gross Carrying Amount |  | $ 97,400 | 49,900 |
Accumulated Amortization |  | (23,079) | (16,338) |
Estimated future amortization expense for intangible assets |  |  |  |
Total |  | $ 74,321 | 33,562 |
Non-compete agreements |  |  |  |
Intangible assets |  |  |  |
Weighted Average Life |  | 5 years |  |
Gross Carrying Amount |  | $ 1,900 | 1,900 |
Accumulated Amortization |  | (1,387) | (820) |
Estimated future amortization expense for intangible assets |  |  |  |
Total |  | $ 513 | 1,080 |
Other |  |  |  |
Intangible assets |  |  |  |
Weighted Average Life |  | 3 years |  |
Gross Carrying Amount |  | $ 275 | 275 |
Accumulated Amortization |  | (145) | (54) |
Estimated future amortization expense for intangible assets |  |  |  |
Total |  | $ 130 | $ 221 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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