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Derivatives - Derivative Gain (Loss) Recognized in Income Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effect of derivative instruments on results of operations |  |  |
Interest expense | $ 93,328 | $ 88,760 | $ 83,899
Accumulated Other Comprehensive Loss | Reclassification adjustments |  |  |
Effect of derivative instruments on results of operations |  |  |
Interest expense | $ 1,283 |  |

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