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Leases Leases (Tables) | 6 Months Ended
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Jun. 30, 2019
Leases [Abstract] |
Lease, Cost [Table Text Block] | The components of lease expense were as follows for the three and six months ended June 30, 2019 (dollars in thousands):
| Three months ended June 30, 2019 |  | Six months ended June 30, 2019
Operating lease cost: |  |  |
Fixed lease cost (Other operating expenses) | $ | 1,106 |  |  | $ | 2,209 |
Variable lease cost (Other operating expenses) | 244 |  |  | 487 |
Total operating lease cost | $ | 1,350 |  |  | $ | 2,696 |
Finance lease cost: |  |  |
Amortization of ROU asset (Depreciation and amortization) | $ | 910 |  |  | $ | 1,820 |
Interest on lease liabilities (Interest expense) | 699 |  |  | 1,398 |
Total finance lease cost | $ | 1,609 |  |  | $ | 3,218 |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] | Supplemental cash flow information related to leases was as follows for the six months ended June 30 (dollars in thousands):
| 2019
Cash paid for amounts included in the measurement of lease liabilities: |
Operating cash outflows: |
Operating lease payments | $ | 4,197 |
Interest on finance lease | 1,398 |
Total operating cash outflows | $ | 5,595 |
Finance cash outflows: |
Principal payments on finance lease | $ | 1,330 |
Supplemental Balance Sheet Information Leases [Table Text Block] | Supplemental balance sheet information related to leases was as follows for June 30, 2019 (dollars in thousands):
| June 30,
| 2019
Operating Leases |
Operating lease ROU assets (Other property and investments-net and other non-current assets) | $ | 70,442 |
Other current liabilities | $ | 4,123 |
Other non-current liabilities and deferred credits | 68,228 |
Total operating lease liabilities | $ | 72,351 |
Finance Leases |
Finance lease ROU assets (Other property and investments-net and other non-current assets) (a) | $ | 52,800 |
Other current liabilities (b) | $ | 2,730 |
Other non-current liabilities and deferred credits (b) | 53,150 |
Total finance lease liabilities | $ | 55,880 |
Weighted Average Remaining Lease Term |
Operating leases | 27.01 years |
Finance leases | 8.39 years |
Weighted Average Discount Rate |
Operating leases | 3.82 | %
Finance leases | 4.88 | %
(a) | At December 31, 2018, the finance lease ROU assets were included in "Net utility property" on the Condensed Consolidated Balance Sheet. Due to the adoption of ASC 842 on January 1, 2019, the Company has reclassified these amounts to "Other property and investments-net and other non-current assets" on the Condensed Consolidated Balance Sheet such that their presentation as of June 30, 2019 is consistent with operating leases.
(b) At December 31, 2018, the finance lease liabilities were included in "Current portion of long-term debt" and "Long-term debt and capital leases" on the Condensed Consolidated Balance Sheet. Due to the adoption of ASC 842 on January 1, 2019, the Company has reclassified these amounts to "Other current liabilities" and "Other non-current liabilities and deferred credits" on the Condensed Consolidated Balance Sheet such that their presentation as of June 30, 2019 is consistent with operating leases.
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | Maturities of lease liabilities (including principal and interest) were as follows as of June 30, 2019 (dollars in thousands):
| Operating Leases |  | Finance Leases
Remainder 2019 | $ | 4,170 |  |  | $ | 2,726 |
2020 | 4,364 |  |  | 5,462 |
2021 | 4,367 |  |  | 5,457 |
2022 | 4,375 |  |  | 5,460 |
2023 | 4,391 |  |  | 5,456 |
Thereafter | 95,939 |  |  | 54,574 |
Total lease payments | $ | 117,606 |  |  | $ | 79,135 |
Less: imputed interest | (45,255 | ) |  | (23,255 | )
Total | $ | 72,351 |  |  | $ | 55,880 |
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] | Future minimum lease payments (including principal and interest) under Topic 840 as of December 31, 2018 (dollars in thousands):
| Operating Leases |  | Finance Leases
2019 | $ | 4,995 |  |  | $ | 5,455 |
2020 | 4,876 |  |  | 5,462 |
2021 | 4,859 |  |  | 5,457 |
2022 | 4,782 |  |  | 5,460 |
2023 | 4,780 |  |  | 5,456 |
Thereafter | 102,389 |  |  | 54,574 |
Total lease payments | $ | 126,681 |  |  | $ | 81,864 |
Less: imputed interest | — |  |  | (24,654 | )
Total | $ | 126,681 |  |  | $ | 57,210 |
Finance Lease, Liability, Maturity [Table Text Block] | Maturities of lease liabilities (including principal and interest) were as follows as of June 30, 2019 (dollars in thousands):
| Operating Leases |  | Finance Leases
Remainder 2019 | $ | 4,170 |  |  | $ | 2,726 |
2020 | 4,364 |  |  | 5,462 |
2021 | 4,367 |  |  | 5,457 |
2022 | 4,375 |  |  | 5,460 |
2023 | 4,391 |  |  | 5,456 |
Thereafter | 95,939 |  |  | 54,574 |
Total lease payments | $ | 117,606 |  |  | $ | 79,135 |
Less: imputed interest | (45,255 | ) |  | (23,255 | )
Total | $ | 72,351 |  |  | $ | 55,880 |
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] | Future minimum lease payments (including principal and interest) under Topic 840 as of December 31, 2018 (dollars in thousands):
| Operating Leases |  | Finance Leases
2019 | $ | 4,995 |  |  | $ | 5,455 |
2020 | 4,876 |  |  | 5,462 |
2021 | 4,859 |  |  | 5,457 |
2022 | 4,782 |  |  | 5,460 |
2023 | 4,780 |  |  | 5,456 |
Thereafter | 102,389 |  |  | 54,574 |
Total lease payments | $ | 126,681 |  |  | $ | 81,864 |
Less: imputed interest | — |  |  | (24,654 | )
Total | $ | 126,681 |  |  | $ | 57,210 |

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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=77888426&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + 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=77888426&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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