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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Table) | 12 Months Ended
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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 year 1 | $ | 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.

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- Definition A rollforward schedule of allowance for doubtful accounts for trade and other accounts receivable balances. + References No definition available. + Details
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- References No definition available. + Details
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