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Restructuring and Related Charges (Tables) | 12 Months Ended
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Dec. 31, 2019
Restructuring and Related Charges [Abstract] |
Schedule of Restructuring Liability by Type of Cost | The following details the changes in the Company’s restructuring liability for the years ended December 31, 2017, 2018, and 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Lease and Related |  | Severance and Other Employee |  | ​ | ​
​ |  | Costs, Net |  | Separation Costs | ​ | Total
Balance at December 31, 2016 | ​ | $ | 11,985 | ​ | $ | — | ​ | $ | 11,985
Restructuring and other charges(1) | ​ |  | — | ​ |  | 3,414 | ​ |  | 3,414
Payments | ​ |  | (3,623) | ​ |  | (3,414) | ​ |  | (7,037)
Adjustments(2) | ​ |  | 419 | ​ |  | — | ​ |  | 419
Balance at December 31, 2017 | ​ |  | 8,781 | ​ |  | — | ​ |  | 8,781
Restructuring and other charges(1) | ​ |  | — | ​ |  | 16,319 | ​ |  | 16,319
Payments | ​ |  | (2,684) | ​ |  | (1,972) | ​ |  | (4,656)
Adjustments(2) | ​ |  | 443 | ​ |  | — | ​ |  | 443
Balance at December 31, 2018(3) | ​ |  | 6,540 | ​ |  | 14,347 | ​ |  | 20,887
Restructuring and other charges(1) | ​ |  | — | ​ |  | 3,920 | ​ |  | 3,920
Payments | ​ |  | — | ​ |  | (9,984) | ​ |  | (9,984)
Adjustments(2) | ​ |  | (6,540) | ​ |  | — | ​ |  | (6,540)
Balance at December 31, 2019(3) | ​ | $ | — | ​ | $ | 8,283 | ​ | $ | 8,283
(1) | Restructuring and other charges were $3.4 million, $16.3 million, and $3.9 million for the years ended December 31, 2017, 2018, and 2019, respectively. Restructuring and other charges are included in Merger and integration costs on the consolidated statements of income.
(2) | For the years ended December 31, 2017 and 2018, adjustments include accretion of interest on lease costs, partially offset by changes in the timing and expected income from subleases. For the year ended December 31, 2019, adjustments represent the impact of adopting ASC 842 on January 1, 2019. In accordance with ASC 842, the lease related restructuring liability balance as of December 31, 2018 was netted against the initial ROU lease asset recognized upon adoption. Asset retirement obligations related to these restructured properties are also included in the adjustments amount.
(3) | The current portion of restructuring liabilities was $9.8 million and $6.4 million as of December 31, 2018 and December 31, 2019, respectively, which are included in accounts payable and accrued expenses. The long-term portion is included in other long-term liabilities.

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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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