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Equity - Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning Balance | $ 1,412,491 | $ 1,462,531
Ending Balance | 1,396,125 | 1,478,113
AOCI Attributable to Parent [Member] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning Balance | (1,033) | (1,939)
Ending Balance | 443 | (7,520)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Other comprehensive income (loss) before reclassifications | 554 | (7,688)
Amounts of loss reclassified from accumulated other comprehensive income to interest expense | $ 922 | $ 2,107

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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