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Equity - Schedule of Changes in AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Changes in Accumulated Other Comprehensive Income |  |
Balance at beginning of period | $ 1,340,835 | $ 1,412,491
Balance at end of period | 1,346,678 | 1,340,835
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Changes in Accumulated Other Comprehensive Income |  |
Balance at beginning of period | 1,065 | (1,033)
Balance at end of period | 76 | 1,065
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |
Changes in Accumulated Other Comprehensive Income |  |
Other comprehensive income before reclassifications | 597 | 1,168
Amounts of (income) loss reclassified from accumulated other comprehensive income (loss) to interest expense | $ (1,586) | $ 930

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