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Leases - Maturity of our operating lease liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Lessee, Lease, Description [Line Items] |  |  |
2019 (remainder of fiscal year) | $ 65,038 |  |
2019 |  |  | $ 68,246
2020 | 12,424 |  | 12,428
2021 | 9,585 |  | 9,478
2022 | 6,621 |  | 6,513
2023 | 5,496 |  | 5,359
Thereafter | 41,618 |  | 42,236
Total lease commitments | 140,782 |  | 144,260
Less imputed interest | 21,643 |  |
Total lease liabilities | 119,139 | $ 119,000 |
Purchased Power Lease Contracts [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
2019 (remainder of fiscal year) | 54,499 |  |
2019 |  |  | 54,499
2020 | 0 |  | 0
2021 | 0 |  | 0
2022 | 0 |  | 0
2023 | 0 |  | 0
Thereafter | 0 |  | 0
Total lease commitments | 54,499 |  | 54,499
Less imputed interest | 814 |  |
Total lease liabilities | 53,685 |  |
Land, Property and Equipment Leases [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
2019 (remainder of fiscal year) | 10,539 |  |
2019 |  |  | 13,747
2020 | 12,424 |  | 12,428
2021 | 9,585 |  | 9,478
2022 | 6,621 |  | 6,513
2023 | 5,496 |  | 5,359
Thereafter | 41,618 |  | 42,236
Total lease commitments | 86,283 |  | $ 89,761
Less imputed interest | 20,829 |  |
Total lease liabilities | $ 65,454 |  |

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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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