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Equity - Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning Balance | $ 1,346,678 | $ 1,340,835
Ending Balance | 1,344,174 | 1,229,296
AOCI Attributable to Parent |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning Balance | 76 | 1,065
Ending Balance | 0 | 1,098
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications | 1 | 606
Amounts of income reclassified from accumulated other comprehensive income to interest expense | $ (77) | $ (573)

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