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Equity and Capital - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ 12 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 5,314 | 10,931 | $ 50,910
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (6,262) | (18,327) | (58,650)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 131 | 1,134 | (10,587)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 5,314 | 10,931 | 50,910
Current period other comprehensive income, net | 5,445 | 12,065 | 40,323
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period | (805) | (6,262) | (18,327)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | 0
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (27) | (19) | (43)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (95) | (8) | 24
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | 0
Current period other comprehensive income, net | (95) | (8) | 24
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period | (122) | (27) | (19)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 12 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 5,314 | 10,931 | 50,910
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (6,289) | (18,346) | (58,693)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 36 | 1,126 | (10,563)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 5,314 | 10,931 | 50,910
Current period other comprehensive income, net | 5,350 | 12,057 | 40,347
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period | (927) | (6,289) | (18,346)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 2 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 28 | 172 | 229
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (112) | (301) | (785)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 271 | 17 | 255
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 28 | 172 | 229
Current period other comprehensive income, net | 299 | 189 | 484
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period | 189 | (112) | (301)
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | 0
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | 0 | 0 | 0
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0 | 0 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | 0
Current period other comprehensive income, net | 0 | 0 | 0
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period | 0 | 0 | 0
AOCI Attributable to Noncontrolling Interest [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 2 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 28 | 172 | 229
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (112) | (301) | (785)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 271 | 17 | 255
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 28 | 172 | 229
Current period other comprehensive income, net | 299 | 189 | 484
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period | 189 | (112) | (301)
AOCI Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 14 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 5,342 | 11,103 | 51,139
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (6,401) | (18,647) | (59,478)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 307 | 1,143 | (10,308)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 5,342 | 11,103 | 51,139
Current period other comprehensive income, net | 5,649 | 12,246 | 40,831
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period | (738) | (6,401) | $ (18,647)
Accounting Standards Update 2017-12 [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (6,250) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period |  | (6,250) |
Accounting Standards Update 2017-12 [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (27) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period |  | (27) |
Accounting Standards Update 2017-12 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (6,277) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period |  | (6,277) |
Accounting Standards Update 2017-12 [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (110) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period |  | (110) |
Accounting Standards Update 2017-12 [Member] | Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | 0 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period |  | 0 |
Accounting Standards Update 2017-12 [Member] | AOCI Attributable to Noncontrolling Interest [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | (110) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period |  | (110) |
Accounting Standards Update 2017-12 [Member] | AOCI Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period | $ (6,387) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period |  | $ (6,387) |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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