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Noncontrolling Interests Redeemable interest in property partnerships (narrative) (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 15, 2015 | Aug. 06, 2015 | Oct. 04, 2012 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest |  |  |  | $ 0 | $ 108,499 | $ 0
Fountain Square |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |
Aggregate purchase price |  |  | $ 385,000 |  |  |
Debt recorded upon consolidation |  |  | $ 211,300 |  |  |
Ownership Percentage | 50.00% | 50.00% | 50.00% |  |  |
Fixed Price to Acquire Remaining Portion of Joint venture |  | $ 100,900 |  |  |  |
Consideration paid |  |  | $ 87,000 |  |  |
Ownership Percentage by Parent |  |  | 50.00% |  |  |
Future Fixed Price to Acquire Remaining Portion of Joint venture |  |  | $ 102,000 |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest | $ 100,900 |  |  |  |  |
Mortgage debt assumed upon acquisition of noncontrolling interest | $ 105,600 |  |  |  |  |

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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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