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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Table)
 12 Months Ended
Dec. 31, 2015
Accounting Policies  
Accounts receivable, allowance for doubtful accounts

The changes in the allowance for doubtful accounts during 2015, 2014 and 2013 were as follows:

 

 

2015

 

2014

 

2013

(Dollars in thousands)

 

 

 

 

 

 

 

 

Balance at beginning of year

$

48,637 

 

$

65,604 

 

$

33,415 

 

Additions, net of recoveries

 

112,292 

 

 

107,861 

 

 

105,629 

 

Deductions

 

(104,701)

 

 

(124,828)

 

 

(73,440)

Balance at end of year1

$

56,228 

 

$

48,637 

 

$

65,604 

 

 

 

 

 

 

 

 

 

 

1

In 2015 and 2014, balance includes an allowance of $5.5 million and $6.1 million, respectively, related to the long-term portion of unbilled equipment installment plan receivables.