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Stockholders' Equity - Reclassification From Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss on cash flow hedges | $ (39,336) | $ (25,531) | $ (19,534)
Income tax benefits | 101,852 | 86,465 | 79,705
Loss on cash flow hedges, net | 245,217 | 197,058 | 182,999
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Interest Rate Contract | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Loss on cash flow hedges | 0 | (219) | (449)
Income tax benefits | 0 | 85 | 174
Loss on cash flow hedges, net | $ 0 | $ (134) | $ (275)

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