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Deferred Costs (Tables) | 12 Months Ended
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Dec. 31, 2018
Deferred Costs [Abstract] |
Summary of Deferred Costs and Amortization of Deferred Costs | The table below presents the activity of deferred costs and amortization of deferred costs (in thousands):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Balances, at beginning of period |  | $ | 39,933 |  |  | $ | 32,117 |
Incurred deferred costs |  |  | 49,583 |  |  |  | 44,628 |
Amortized deferred costs |  |  | (44,041 | ) |  |  | (36,812 | )
Balances, at end of period |  | $ | 45,475 |  |  | $ | 39,933 |

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