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LEASES (Tables) | 9 Months Ended
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Sep. 30, 2019
Leases |
Schedule of components of lease expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, 2019 | ​ | September 30, 2019 | ​
​ | ​ | (in thousands) | ​
Operating lease expense | ​ | $ | 5,651 | ​ | $ | 16,632 | ​
Variable lease expense | ​ | ​ | 878 | ​ | ​ | 2,491 | ​
Sublease income | ​ | ​ | (99) | ​ | ​ | (235) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total operating lease expense | ​ | $ | 6,430 | ​ | $ | 18,888 | ​
Schedule of operating cash flows from operating lease activity | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended | ​
​ | ​ | September 30, 2019 | ​
​ | ​ | (in thousands) | ​
Noncash change in operating right-of-use assets | ​ | $ | 15,093 | ​
Change in operating lease liabilities | ​ | ​ | (14,567) | ​
Operating right-use-of-assets and lease liabilities, net | ​ | $ | 526 | ​
​ | ​ | ​ | ​ | ​
Cash paid for amounts included in the measurement of operating lease liabilities | ​ | $ | (16,256) | ​
Schedule of supplemental balance sheet information related to lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2019 | ​
​ | ​ | (in thousands, except lease term and discount rate) | ​
​ | ​ | ​ | ​ | ​ | Land and | ​ | Equipment | ​
Operating leases | ​ | ​ | Total | ​ | Structures | ​ | and Others | ​
Operating right-of-use assets (long-term) | ​ | $ | 67,404 | ​ | $ | 65,906 | ​ | $ | 1,498 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liabilities (current) | ​ | $ | 18,492 | ​ | $ | 17,498 | ​ | $ | 994 | ​
Operating lease liabilities (long-term) | ​ |  | 52,782 | ​ | ​ | 52,285 | ​ | ​ | 497 | ​
Total operating lease liabilities | ​ | $ | 71,274 | ​ | $ | 69,783 | ​ | $ | 1,491 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average remaining lease term (in years) | ​ | ​ | 5.4 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average discount rate | ​ | ​ | 3.88% | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of maturities of operating lease liabilities | Maturities of operating lease liabilities at September 30, 2019 were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Equipment | ​
​ | ​ | ​ | ​ | ​ | Land and | ​ | and | ​
​ |  | Total |  | Structures(1) |  | Other |
​ |  | (in thousands) | ​
Remainder of 2019 | ​ | $ | 5,419 | ​ | $ | 5,156 | ​ | $ | 263 | ​
2020 | ​ |  | 20,131 | ​ |  | 19,132 | ​ |  | 999 | ​
2021 | ​ |  | 15,604 | ​ |  | 15,334 | ​ |  | 270 | ​
2022 | ​ |  | 11,189 | ​ |  | 11,189 | ​ |  | — | ​
2023 | ​ |  | 8,068 | ​ |  | 8,068 | ​ |  | — | ​
Thereafter | ​ |  | 18,676 | ​ |  | 18,676 | ​ |  | — | ​
Total lease payments | ​ | ​ | 79,087 | ​ | ​ | 77,555 | ​ | ​ | 1,532 | ​
Less imputed interest | ​ | ​ | (7,813) | ​ | ​ | (7,772) | ​ | ​ | (41) | ​
Total | ​ | $ | 71,274 | ​ | $ | 69,783 | ​ | $ | 1,491 | ​
​
(1) | Excludes future minimum payments for a lease which was executed but had not yet commenced as of September 30, 2019 of $34.7 million which will be paid over 12 years. The Company plans to take possession of the leased space in mid-2020.
​
Schedule of maturities of operating lease liabilities at December 31, 2018 | The future minimum rental commitments, net of minimum rentals to be received under noncancelable subleases, as of December 31, 2018 for all noncancelable operating leases were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 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 | ​ |  | — | ​
Total | ​ | $ | 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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- 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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