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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2019
Leases |
Schedule of components of lease expense | ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​
​ | ​ | (in thousands) | ​
Operating lease expense | ​ | $ | 22,291 | ​
Variable lease expense | ​ | ​ | 3,366 | ​
Sublease income | ​ | ​ | (324) | ​
​ | ​ | ​ | ​ | ​
Total operating lease expense(1) | ​ | $ | 25,333 | ​
(1) | Operating lease expense excludes short-term leases with a term of 12 months or less.
Schedule of operating cash flows from operating lease activity | ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​
​ | ​ | (in thousands) | ​
Noncash change in operating right-of-use assets | ​ | $ | 20,439 | ​
Change in operating lease liabilities | ​ | ​ | (19,711) | ​
Operating right-use-of-assets and lease liabilities, net | ​ | $ | 728 | ​
​ | ​ | ​ | ​ | ​
Cash paid for amounts included in the measurement of operating lease liabilities | ​ | $ | (21,714) | ​
Schedule of supplemental balance sheet information related to lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2019
​ | ​ | (in thousands, except lease term and discount rate)
​ | ​ | ​ | ​ | ​ | Land and | ​ | Equipment
​ | ​ | ​ | Total | ​ | Structures | ​ | and Others
Operating right-of-use assets (long-term) | ​ | $ | 68,470 | ​ | $ | 67,227 | ​ | $ | 1,243
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liabilities (current) | ​ | $ | 20,265 | ​ | $ | 19,293 | ​ | $ | 972
Operating lease liabilities (long-term) | ​ |  | 52,277 | ​ | ​ | 52,008 | ​ | ​ | 269
Total operating lease liabilities | ​ | $ | 72,542 | ​ | $ | 71,301 | ​ | $ | 1,241
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average remaining lease term (in years) | ​ | ​ | 5.3 | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average discount rate | ​ | ​ | 3.77% | ​ | ​ | ​ | ​ | ​ | ​
Schedule of maturities of operating lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Equipment | ​
​ | ​ | ​ | ​ | ​ | Land and | ​ | and | ​
​ |  | Total |  | Structures(1) |  | Other |
​ |  | (in thousands) | ​
2020 | ​ | $ | 22,576 | ​ | $ | 21,578 | ​ | $ | 998 | ​
2021 | ​ |  | 16,737 | ​ |  | 16,467 | ​ |  | 270 | ​
2022 | ​ |  | 12,253 | ​ |  | 12,253 | ​ |  | — | ​
2023 | ​ |  | 8,871 | ​ |  | 8,871 | ​ |  | — | ​
2024 | ​ |  | 6,275 | ​ |  | 6,275 | ​ |  | — | ​
Thereafter | ​ |  | 13,309 | ​ |  | 13,309 | ​ |  | — | ​
Total lease payments | ​ | ​ | 80,021 | ​ | ​ | 78,753 | ​ | ​ | 1,268 | ​
Less imputed interest | ​ | ​ | (7,479) | ​ | ​ | (7,452) | ​ | ​ | (27) | ​
Total | ​ | $ | 72,542 | ​ | $ | 71,301 | ​ | $ | 1,241 | ​
(1) | Excludes future minimum payments of $36.6 million for two operating leases for office space and a service center facility, that were executed but had not yet commenced as of December 31, 2019, which will be paid over terms of approximately 12 years. The Company has taken possession of the office space location as of January 1, 2020 and possession of the service center facility is expected in late-summer 2020, pending Lessor’s completion of construction to the premises.
Schedule of maturities of operating lease liabilities at December 31, 2018 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Equipment | ​
​ | ​ | ​ | ​ | ​ | Land and | ​ | and | ​
​ |  | Total |  | Structures(1) |  | Other |
​ |  | ​ | (in thousands) | ​
2019 | ​ | $ | 19,130 | ​ | $ | 18,067 | ​ | $ | 1,063 | ​
2020 | ​ |  | 14,620 | ​ |  | 13,676 | ​ |  | 944 | ​
2021 | ​ |  | 10,972 | ​ |  | 10,716 | ​ |  | 256 | ​
2022 | ​ |  | 7,125 | ​ |  | 7,125 | ​ |  | — | ​
2023 | ​ |  | 4,477 | ​ |  | 4,477 | ​ |  | — | ​
Thereafter | ​ |  | 5,850 | ​ |  | 5,850 | ​ |  | — | ​
​ | ​ | $ | 62,174 | ​ | $ | 59,911 | ​ | $ | 2,263 | ​
(1) | Excludes future minimum payments for leases which were executed but had not yet commenced as of December 31, 2018 of approximately $21.0 million which will be paid over 10 years.

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