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Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Intangible assets |  |  |  |  |
Total | $ 39,860 |  | $ 39,860 |  | $ 39,581
Amortization expense of intangible assets | 1,719 | $ 1,843 | 3,370 | $ 3,687 |
Estimated future amortization expense for intangible assets |  |  |  |  |
2015 (remaining six months) | 3,405 |  | 3,405 |  |
2016 | 6,460 |  | 6,460 |  |
2017 | 6,201 |  | 6,201 |  |
2018 | 5,719 |  | 5,719 |  |
2019 | 5,509 |  | 5,509 |  |
Thereafter | 12,566 |  | 12,566 |  |
Tradename |  |  |  |  |
Intangible assets |  |  |  |  |
Total | 16,582 |  | $ 16,582 |  | 18,194
Tradename | Minimum |  |  |  |  |
Intangible assets |  |  |  |  |
Amortization Period |  |  | 3 years |  |
Tradename | Maximum |  |  |  |  |
Intangible assets |  |  |  |  |
Amortization Period |  |  | 10 years |  |
Non-compete agreements |  |  |  |  |
Intangible assets |  |  |  |  |
Total | 1,853 |  | $ 1,853 |  | 1,074
Non-compete agreements | Minimum |  |  |  |  |
Intangible assets |  |  |  |  |
Amortization Period |  |  | 2 years |  |
Non-compete agreements | Maximum |  |  |  |  |
Intangible assets |  |  |  |  |
Amortization Period |  |  | 5 years |  |
Customer relationships |  |  |  |  |
Intangible assets |  |  |  |  |
Total | $ 21,425 |  | $ 21,425 |  | $ 20,313
Customer relationships | Minimum |  |  |  |  |
Intangible assets |  |  |  |  |
Amortization Period |  |  | 5 years |  |
Customer relationships | Maximum |  |  |  |  |
Intangible assets |  |  |  |  |
Amortization Period |  |  | 15 years |  |

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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