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Deferred Credits (Notes) | 12 Months Ended
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Dec. 31, 2013
Deferred credits [Abstract] |
Deferred credits | Deferred Credits and Other Liabilities The following is a summary of the Company's "deferred credits and other liabilities" as presented on the Company's consolidated balance sheet. See also notes 2 and 3.
|  | December 31,
|  | 2013 |  | 2012
Deferred ground lease payable |  | $ | 357,419 |  |  | $ | 312,262 |
Customer prepaid rent |  | 350,474 |  |  | 173,420 |
Above market leases for land interests, net (a) |  | 276,319 |  |  | 58,195 |
Deferred credits, net (b) |  | 244,537 |  |  | 271,123 |
Asset retirement obligation (see note 15) |  | 118,403 |  |  | 94,953 |
Other liabilities |  | 2,767 |  |  | 618 |
|  | $ | 1,349,919 |  |  | $ | 910,571 |
(a) | The Company recorded $145.5 million and $17.0 million related to above-market leases for land interests under acquired wireless infrastructure for the years ended December 31, 2013 and 2012, respectively, which is inclusive of adjustments made during 2013 related to the T-Mobile purchase price allocation.
(b) | For the year ended December 31, 2012, the Company recorded deferred credits of $291.9 million related to below-market tenant leases as a result of the purchase price allocation for the NextG Acquisition. The below-market tenant leases recorded in the NextG Acquisition had a weighted-average amortization period of 11 years.
For the years ended December 31, 2013, 2012, and 2011, the Company recorded $7.2 million, $3.4 million, and $3.8 million, respectively, as a decrease to "site rental costs of operations" for the amortization of above-market leases for land interests under the Company's towers. The estimated amortization expense related to above-market leases for land interests under the Company's towers recorded to site rental costs of operations for the years ended December 31, 2014 to 2018 is as follows:
| Years Ending December 31,
| 2014 |  | 2015 |  | 2016 |  | 2017 |  | 2018
Above-market leases for land interests | $ | 21,854 |  |  | $ | 21,839 |  |  | $ | 21,796 |  |  | $ | 21,767 |  |  | $ | 21,741 |
For the years ended December 31, 2013 and 2012, the Company recognized $29.6 million and $20.8 million, respectively, in site rental revenues related to the amortization of below market tenant leases. The following table summarizes the estimated annual amounts related to below-market tenant leases expected to be amortized into site rental revenues for the years ended December 31, 2014 to 2018 are as follows:
| Years Ending December 31,
| 2014 |  | 2015 |  | 2016 |  | 2017 |  | 2018
Below-market tenant leases | $ | 28,670 |  |  | $ | 27,395 |  |  | $ | 27,021 |  |  | $ | 24,243 |  |  | $ | 21,428 |

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