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Schedule IV - Mortgage Loans on Real Estate - Reconciliation of Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |
Balance at January 1 | $ 934,964 | $ 726,426 | $ 827,796
Additions: |  |  |
New mortgage loans | 25,893 | 237,031 | 476,332
Additions under existing mortgage loans | 165,275 | 92,887 | 13,108
Other | 30,694 | 33,080 | 26,156
Deductions: |  |  |
Collections of principal | (247,431) | (151,464) | (532,465)
Recovery of (provision for) loan losses | 9,747 | (6,186) | 483
Transfers (to) from real estate and equity investments | (3,177) | 3,261 | (84,912)
Amortization of premium | (60) | (71) | (72)
Balance at December 31 | 915,905 | 934,964 | 726,426
Charge offs | $ 10,100 | $ 1,000 | $ 239,600

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- Definition Mortgage Loan on Real Estate, Transfers From Real Estate and Equity Investments + References No definition available. + Details
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- Definition Total amount of additions under existing mortgage loans on real estate during the reporting period. + References No definition available. + Details
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- Definition Amount of decrease in mortgage loans on real estate from amortization of premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Total amount of new mortgage loans on real estate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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