Intangible assets, net as of December 31, 2016 and 2015 consisted of the following (in thousands):

Tradenames, referral relationships and non-compete agreements are related to the businesses acquired. 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. 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, 2016, 2015 and 2014 (in thousands):

For one acquisition, the value assigned to tradename was being amortized over the term of the six year agreement in which the Company had acquired the right to use the specific tradename. In 2016, the remaining value of this tradename was charged to earnings and included in amortization expense in the above table as the Company decided to combine two acquired operations in Georgia and the tradename under this six year agreement will no longer be used.

The remaining balances of the referral relationships and non-compete agreements is expected to be amortized as follows (in thousands):