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Amortizable Intangible Assets
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortizable Intangible Assets Amortizable Intangible Assets
Amortizable intangible assets at December 31, 2017 and 2016 consisted of the following:
 
December 31, 2017
 
December 31, 2016
(in thousands)
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Weighted
Average
Life in
Years(1)
 
Gross
Carrying
Value
 
Accumulated
Amortization
 
Net
Carrying
Value
 
Weighted
Average
Life in
Years(1)
Purchased customer accounts
$
1,464,274

 
$
(824,584
)
 
$
639,690

 
15.0
 
$
1,447,680

 
$
(741,770
)
 
$
705,910

 
15.0
Non-compete agreements
30,287

 
(28,972
)
 
1,315

 
6.8
 
29,668

 
(28,124
)
 
1,544

 
6.8
Total
$
1,494,561

 
$
(853,556
)
 
$
641,005

 
 
 
$
1,477,348

 
$
(769,894
)
 
$
707,454

 
 
(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 $81.0 million, $76.5 million, $69.1 million, $65.9 million and $61.4 million, respectively.