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Acquired Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |
Total acquired intangible assets |  | $ 98,901 |  | $ 98,901 |  | $ 98,966
Less accumulated amortization | [1] | (47,668) |  | (47,668) |  | (43,853)
Net acquired intangible assets |  | 51,233 |  | 51,233 |  | 55,113
Amortization of acquired intangible assets [Abstract] |  |  |  |  |  |
Amortization expense |  | 1,900 | $ 2,100 | 3,800 | $ 4,200 |
Estimated amortization expense, remainder of 2018 |  | 3,700 |  | 3,700 |  |
Estimated amortization expense in year 2019 |  | 6,300 |  | 6,300 |  |
Estimated amortization expense in year 2020 |  | 5,900 |  | 5,900 |  |
Estimated amortization expense in year 2021 |  | 4,600 |  | 4,600 |  |
Estimated amortization expense in years 2022 through 2031 |  | 25,500 |  | 25,500 |  |
Customer Relationships [Member] |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |
Total acquired intangible assets |  | 87,226 |  | 87,226 |  | 87,290
Trademarks and Trade Names [Member] |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |
Total acquired intangible assets |  | 6,800 |  | 6,800 |  | 6,800
Intangible assets acquired [Abstract] |  |  |  |  |  |
Amount of acquired indefinite-lived intangible assets |  | 5,200 |  | 5,200 |  |
Non-compete Agreements [Member] |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |
Total acquired intangible assets |  | 3,192 |  | 3,192 |  | 3,193
Patents [Member] |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |
Total acquired intangible assets |  | 723 |  | 723 |  | 723
Supply Agreements [Member] |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |
Total acquired intangible assets |  | 800 |  | 800 |  | 800
Leaseholds [Member] |  |  |  |  |  |
Indefinite Lived Intangible Assets [Abstract] |  |  |  |  |  |
Total acquired intangible assets |  | $ 160 |  | $ 160 |  | $ 160
[1] | Applies to all intangible assets, except for trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.

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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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