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Leases - Maturity of our operating lease liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Lessee, Lease, Description [Line Items] |  |  |
2019 (remaining six months of 2019) | $ 56,386 |  |
2019 |  |  | $ 68,246
2020 | 12,868 |  | 12,428
2021 | 10,029 |  | 9,478
2022 | 6,988 |  | 6,513
2023 | 5,838 |  | 5,359
2024 | 3,691 |  |
Thereafter | 38,506 |  |
Thereafter |  |  | 42,236
Total lease commitments | 134,306 |  | 144,260
Less imputed interest | 20,705 |  |
Total lease liabilities | 113,601 | $ 119,000 |
Purchased Power Lease Contracts |  |  |
Lessee, Lease, Description [Line Items] |  |  |
2019 (remaining six months of 2019) | 49,051 |  |
2019 |  |  | 54,499
2020 | 0 |  | 0
2021 | 0 |  | 0
2022 | 0 |  | 0
2023 | 0 |  | 0
2024 | 0 |  |
Thereafter | 0 |  |
Thereafter |  |  | 0
Total lease commitments | 49,051 |  | 54,499
Less imputed interest | 294 |  |
Total lease liabilities | 48,757 |  |
Land, Property & Equipment Leases |  |  |
Lessee, Lease, Description [Line Items] |  |  |
2019 (remaining six months of 2019) | 7,335 |  |
2019 |  |  | 13,747
2020 | 12,868 |  | 12,428
2021 | 10,029 |  | 9,478
2022 | 6,988 |  | 6,513
2023 | 5,838 |  | 5,359
2024 | 3,691 |  |
Thereafter | 38,506 |  |
Thereafter |  |  | 42,236
Total lease commitments | 85,255 |  | $ 89,761
Less imputed interest | 20,411 |  |
Total lease liabilities | $ 64,844 |  |

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- Definition Lessee, Operating Lease, Liability, Payments, Due after Year Six + References No definition available. + 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 Amount of lessee's undiscounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year. + 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 Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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