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Amortizable Intangible Assets | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Amortizable Intangible Assets | Amortizable Intangible Assets Amortizable intangible assets at June 30, 2018 and December 31, 2017 consisted of the following:
| June 30, 2018 |  | December 31, 2017
(in thousands) | Gross carrying value |  | Accumulated amortization |  | Net carrying value |  | Weighted average life (years)(1) |  | Gross carrying value |  | Accumulated amortization |  | Net carrying value |  | Weighted average life (years)(1)
Purchased customer accounts | $ | 1,504,859 |  |  | $ | (865,347 | ) |  | $ | 639,512 |  |  | 15.0 |  | $ | 1,464,274 |  |  | $ | (824,584 | ) |  | $ | 639,690 |  |  | 15.0
Non-compete agreements | 30,457 |  |  | (29,415 | ) |  | 1,042 |  |  | 6.8 |  | 30,287 |  |  | (28,972 | ) |  | 1,315 |  |  | 6.8
Total | $ | 1,535,316 |  |  | $ | (894,762 | ) |  | $ | 640,554 |  |  |  |  | $ | 1,494,561 |  |  | $ | (853,556 | ) |  | $ | 641,005 |  |  |
(1) | Weighted average life calculated as of the date of acquisition.
Amortization expense for amortizable intangible assets for the years ending December 31, 2018, 2019, 2020, 2021 and 2022 is estimated to be $82.9 million, $79.2 million, $71.9 million, $68.6 million, and $64.2 million, respectively.

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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 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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