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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract] |
Finance Lease, Liability, Maturity [Table Text Block] | The following tables detail the future minimum lease payments under the Company's current leases and a reconciliation of undiscounted and discounted cash flows for operating and finance leases (dollars in thousands):
| Payments due by period
| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Thereafter
Operating Lease Obligations | $ | 14,270 |  |  | $ | 13,950 |  |  | $ | 13,469 |  |  | $ | 13,316 |  |  | $ | 13,526 |  |  | $ | 350,440 |
Finance Lease Obligations | 1,080 |  |  | 1,082 |  |  | 1,084 |  |  | 1,087 |  |  | 1,089 |  |  | 39,044 |
| $ | 15,350 |  |  | $ | 15,032 |  |  | $ | 14,553 |  |  | $ | 14,403 |  |  | $ | 14,615 |  |  | $ | 389,484 |
| Total undiscounted cash flows |  | Total lease liabilities |  | Difference between discounted and undiscounted cash flows
Operating Lease Obligations | $ | 418,971 |  |  | $ | 161,313 |  |  | $ | 257,658 |
Finance Lease Obligations | 44,466 |  |  | 20,166 |  |  | 24,300 |
| $ | 463,437 |  |  | $ | 181,479 |  |  | $ | 281,958 |
Lease, Weighted-Average Remaining Lease Term and Discount Rate [Table Text Block] | The following table details the weighted average remaining lease term and discount rates for the Company’s ground and office leases:
Weighted-average remaining lease term - finance leases | 25 years
Weighted-average remaining lease term - operating leases | 42 years
Weighted-average discount rate - finance leases | 4.63 | %
Weighted-average discount rate - operating leases | 4.74 | %
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | The following tables detail the future minimum lease payments under the Company's current leases and a reconciliation of undiscounted and discounted cash flows for operating and finance leases (dollars in thousands):
| Payments due by period
| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Thereafter
Operating Lease Obligations | $ | 14,270 |  |  | $ | 13,950 |  |  | $ | 13,469 |  |  | $ | 13,316 |  |  | $ | 13,526 |  |  | $ | 350,440 |
Finance Lease Obligations | 1,080 |  |  | 1,082 |  |  | 1,084 |  |  | 1,087 |  |  | 1,089 |  |  | 39,044 |
| $ | 15,350 |  |  | $ | 15,032 |  |  | $ | 14,553 |  |  | $ | 14,403 |  |  | $ | 14,615 |  |  | $ | 389,484 |
| Total undiscounted cash flows |  | Total lease liabilities |  | Difference between discounted and undiscounted cash flows
Operating Lease Obligations | $ | 418,971 |  |  | $ | 161,313 |  |  | $ | 257,658 |
Finance Lease Obligations | 44,466 |  |  | 20,166 |  |  | 24,300 |
| $ | 463,437 |  |  | $ | 181,479 |  |  | $ | 281,958 |
Future Minimum Lease Payments Under Current Leases |
| Payments due by period
| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Thereafter
Operating Lease Obligations | $ | 14,270 |  |  | $ | 13,950 |  |  | $ | 13,469 |  |  | $ | 13,316 |  |  | $ | 13,526 |  |  | $ | 350,440 |
Finance Lease Obligations | 1,080 |  |  | 1,082 |  |  | 1,084 |  |  | 1,087 |  |  | 1,089 |  |  | 39,044 |
| $ | 15,350 |  |  | $ | 15,032 |  |  | $ | 14,553 |  |  | $ | 14,403 |  |  | $ | 14,615 |  |  | $ | 389,484 |
| Total undiscounted cash flows |  | Total lease liabilities |  | Difference between discounted and undiscounted cash flows
Operating Lease Obligations | $ | 418,971 |  |  | $ | 161,313 |  |  | $ | 257,658 |
Finance Lease Obligations | 44,466 |  |  | 20,166 |  |  | 24,300 |
| $ | 463,437 |  |  | $ | 181,479 |  |  | $ | 281,958 |

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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