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Debt - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2007 | Jun. 30, 2017 | Dec. 31, 2016
LCIF [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 4.70% | 4.70%
Co-borrower debt |  | $ 103,165,000 | $ 146,404,000
Minimum [Member] | LCIF [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 4.00% | 4.00%
Maximum [Member] | LCIF [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 6.50% | 6.50%
Mortgages and Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 4.60% | 4.60%
Long-term debt |  | $ 703,845,000 | $ 738,047,000
Mortgages and Notes Payable [Member] | LCIF [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  | $ 168,737,000 | $ 169,212,000
Mortgages and Notes Payable [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 2.20% | 2.20%
Mortgages and Notes Payable [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 7.80% | 7.80%
Unsecured Debt [Member] | Unsecured Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | $ 905,000,000 |
Maximum borrowing capacity with lender approval |  | 1,810,000,000 |
Unsecured Debt [Member] | Unsecured Credit Agreement [Member] | LCIF [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | 905,000,000 |
Maximum borrowing capacity with lender approval |  | 1,810,000,000 |
6.804% Trust Preferred Securities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.804% |  |
Face amount of debt instrument | $ 200,000,000 |  |
Principal amount outstanding |  | 129,120,000 | $ 129,120,000
Unamortized debt issuance costs |  | $ 1,974,000 | $ 2,024,000
Interest rate, effective percentage |  | 2.87% |
6.804% Trust Preferred Securities [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.70% |  |

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- Definition Line of Credit Facility, Maximum Borrowing Capacity with Lender Approval + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of joint and several liability recognized in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 405 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64861610&loc=SL34748401-199205 + Details
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- Definition This is the principal amount outstanding for securitized loans only (across all types of loans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719 + Details
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