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Intangible Assets, net | 12 Months Ended
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Dec. 31, 2015
Intangible Assets, net [Abstract] |
Intangible Assets, net | 8. Intangible Assets, net Intangible assets, net as of December 31, 2015 and 2014 consisted of the following (in thousands):
| December 31, 2015 | December 31, 2014
Tradenames, net of accumulated amortization of $170 and $86, respectively | $ | 17,660 |  | $ | 14,427 |
Referral relationships, net of accumulated amortization of $3,763 and $2,610, respectively |  | 10,866 |  |  | 8,951 |
Non-compete agreements, net of accumulated amortization of $2,855 and $2,377, respectively |  | 1,770 |  |  | 1,529 |
| $ | 30,296 |  | $ | 24,907 |
Tradenames, referral relationships and non-compete agreements are related to the businesses acquired. Typically, the value assigned to tradenames has an indefinite life and is tested at least annually for impairment using the relief from royalty method in conjunction with the Company’s annual goodwill impairment test. However, for one acquisition, the value assigned to tradename is being amortized over the term of the six year agreement in which the Company has acquired the right to use the specific tradename. The value assigned to referral relationships is being amortized over their respective estimated useful lives which range from six to 16 years. Non-compete agreements are amortized over the respective term of the agreements which range from five to six years. The following table details the amount of amortization expense recorded for intangible assets for the years ended December 31, 2015, 2014 and 2013 (in thousands):
| Year Ended December 31, 2015 | Year Ended December 31, 2014 | Year Ended December 31, 2013
Tradenames | $ | 84 |  | $ | 86 |  | $ | — |
Referral relationships |  | 1,153 |  |  | 1,028 |  |  | 521 |
Non-compete agreements |  | 478 |  |  | 427 |  |  | 372 |
| $ | 1,715 |  | $ | 1,541 |  | $ | 893 |
During 2013, in conjunction with the sale of the physician services business, the Company wrote-off the referral relationships and non-compete agreements related to this business which included accumulated amortization of $156,000 and $270,000, respectively. The remaining balances of the tradename, referral relationships and non-compete agreements is expected to be amortized as follows (in thousands):
Tradename | Referral Relationships | Non-Compete Agreements
Years | Annual Amount | Years | Annual Amount | Years | Annual Amount
2016 |  | 83 |  |  | 2016 |  |  | 1,234 |  |  | 2016 |  |  | 485 |
2017 |  | 84 |  |  | 2017 |  |  | 1,234 |  |  | 2017 |  |  | 441 |
2018 |  | 83 |  |  | 2018 |  |  | 1,188 |  |  | 2018 |  |  | 384 |
2019 |  | 80 |  |  | 2019 |  |  | 1,099 |  |  | 2019 |  |  | 312 |
|  |  |  |  | 2020 |  |  | 1,099 |  |  | 2020 |  |  | 99 |
|  |  |  |  | 2021 |  |  | 1,099 |  |  | 2021 |  |  | 49 |
|  |  |  |  | 2022 |  |  | 1,050 |  |  |  |  |  |  |
|  |  |  |  | 2023 |  |  | 942 |  |  |  |  |  |  |
|  |  |  |  | 2024 |  |  | 824 |  |  |  |  |  |  |
|  |  |  |  | 2025 |  |  | 716 |  |  |  |  |  |  |
|  |  |  |  | 2026 |  |  | 255 |  |  |  |  |  |  |
|  |  |  |  | 2027 |  |  | 107 |  |  |  |  |  |  |
|  |  |  |  | 2028 |  |  | 19 |  |  |  |  |  |  |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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