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Debt - Narrative (Details) | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 31, 2019 USD ($) | May 31, 2019 | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Aug. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | May 31, 2015 USD ($) | Nov. 18, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total | $ 783,878,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 783,900,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  | $ 89,000,000 |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement Agreement, Amount |  |  |  |  |  |  |  |  |  |  |  | $ 14,000,000.0
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 0 |  |  |  |  |  |  |  |  |  |  |
Mortgages [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total | 33,513,000 | 36,698,000 |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 33,878,000 | $ 37,115,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Collateral Amount | $ 43,200,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate | 4.23% | 4.40% |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total | $ 237,274,000 | $ 237,403,000 |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 240,000,000 | 240,000,000 |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2025 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.16% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2027 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.26% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 50,000,000.0 |
Unsecured Debt [Member] | 2028 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.42% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2030 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 125,000,000.0 |  |  |  |  |
Unsecured Debt [Member] | 2031 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.47% |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 125,000,000.0 |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | Revolving Credit and Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 600,000,000.0 |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | Revolving Credit and Term Loan Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity, Additional Commitments Available | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Credit facility extension times | 2 |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2019 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 3.62% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 20,300,000 |  |  |
Unsecured Debt [Member] | 2023 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 40,000,000 | 40,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | Borrowings under the 2023 Term Loan are priced at LIBOR plus 85 to 165 basis points, depending on the Company’s credit rating. The Company entered into an interest rate swap agreement to fix LIBOR at 140 basis points until maturity |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 2.40% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 40,000,000.0 |  |
Unsecured Debt [Member] | 2023 Term Loan [Member] | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Derivative Instrument Basis Fixed Rate | 1.40% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2023 Term Loan [Member] | Minimum [Member] | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 0.85% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2023 Term Loan [Member] | Maximum [Member] | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 1.65% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2024 Term Loan Facilities[Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 100,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.13% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2024 Term Loan Facilities[Member] | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Derivative Instrument Basis Fixed Rate | 2.13% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2024 Term Loan Facilities[Member] | Minimum [Member] | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 0.85% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2024 Term Loan Facilities[Member] | Maximum [Member] | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 1.65% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2024 Term Loan Facility One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | Borrowings under the unsecured 2024 Term Loan Facilities bear interest at a variable LIBOR plus 85 to 165 basis points, depending on the Company’s credit rating. The Company utilized existing interest rate swap agreements to effectively fix LIBOR at 213 basis points until September 2020 for the $35 Million Term Loan and July 2021 for the $65 Million Term Loan (refer to Note 9 – Derivative Instruments and Hedging Activity). |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 65,000,000.0 |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2024 Term Loan Facility Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 35,000,000.0 |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2026 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 100,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | Borrowings under the 2026 Term Loan are priced at LIBOR plus 145 to 240 basis points, depending on the Company’s credit rating. The Company entered into interest rate swap agreements to fix LIBOR at 266 basis points until maturity. |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.26% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |
Unsecured Debt [Member] | 2026 Term Loan [Member] | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Derivative Instrument Basis Fixed Rate | 2.66% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2026 Term Loan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 1.45% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2026 Term Loan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 2.40% |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total | $ 509,253,000 | 509,198,000 |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 510,000,000 | 510,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | 100,000,000.0 |
Senior Unsecured Debt [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 500,000,000.0 |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | 2025 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 50,000,000.0 |
Senior Unsecured Debt [Member] | 2027 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | 2028 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 60,000,000 | 60,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 60,000,000.0 |  |
Senior Unsecured Debt [Member] | 2029 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 100,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.19% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |
Senior Unsecured Debt [Member] | 2030 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 125,000,000 | 125,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.32% |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | 2031 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 125,000,000 | 125,000,000 |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | 2031 Senior Unsecured Notes [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.41% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 100,000,000.0 |  |  |  | $ 100,000,000.0 |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | 2031 Senior Unsecured Notes [Member] | Blended All-In Including Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.42% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 125,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | Revolving Credit and Term Loan Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | (i) LIBOR plus a margin that is based upon the Company’s credit rating, or (ii) the Base Rate (which is defined as the greater of the rate of interest as publicly announced from time to time by PNC Bank, National Association, as its prime rate, the Federal Funds Open Rate plus 0.50%, or the Daily Eurodollar Rate plus 1.0%) plus a margin that is based upon the Company’s credit rating. The margins for the Revolving Credit Facility range in amount from 0.775% to 1.450% for LIBOR-based loans and 0.00% to 0.45% for Base Rate loans, depending on the Company’s credit rating. The margins for the Revolving Credit Facility are subject to improvement based on the Company’s leverage ratio, provided its credit rating meets a certain threshold. |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | Revolving Credit and Term Loan Facility [Member] | Revolving Credit Facility [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 0.50% |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | Revolving Credit and Term Loan Facility [Member] | Revolving Credit Facility [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 1.00% |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | Revolving Credit and Term Loan Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member] | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 0.775% |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | Revolving Credit and Term Loan Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 0.00% |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | Revolving Credit and Term Loan Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member] | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 1.45% |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | Revolving Credit and Term Loan Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate | 0.45% |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | 2024 Term Loan Facility One [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 65,000,000 |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit | $ 0 |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Debt [Member] | 2024 Term Loan Facility Two [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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