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Lessee ROU Assets and Lease Liabilities Lessee ROU Assets and Lease Liabilities (Tables) | 6 Months Ended
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Jun. 29, 2019
Leases [Abstract] |
Lessee Operating Lease Balance Sheet Classification | Balance sheet classifications related to the Company’s operating leases for the period ended June 29, 2019 are as follows:
| Balance sheet classification |  | June 29, 2019
Lessee ROU assets | Other non-current assets |  | $ | 19,800 |
Lessee current lease liabilities | Other current liabilities |  | 4,543 |
Lessee non-current lease liabilities | Other non-current liabilities |  | 16,447 |
Total operating lease liabilities |  |  | $ | 20,990 |
Lessee, Operating Lease, Liability, Maturity | As of June 29, 2019, estimated future operating lease payments for each of the following fiscal years were as follows (in thousands):
Fiscal year | Amount
2019 (balance of year) | $ | 2,819 |
2020 | 4,553 |
2021 | 2,744 |
2022 | 1,941 |
2023 | 1,748 |
Thereafter(1) | 10,846 |
Total | 24,651 |
Imputed interest | (3,661 | )
Present value | $ | 20,990 |
______________ (1) Includes optional renewal period for certain leases.
Contractual Obligation, Fiscal Year Maturity Schedule | As of December 29, 2018, the estimated future minimum lease payments, including interest, under operating leases for each of the following fiscal years ending on or about December 31 were as follows (in thousands):
Fiscal year | Amount
2019 | $ | 6,926 |
2020 | 4,422 |
2021 | 2,384 |
2022 | 1,701 |
2023 | 1,568 |
Thereafter(1) | 9,921 |
Total | $ | 26,922 |
______________ (1) Includes optional renewal period for certain leases.
Lease, Cost | Lease costs for the three and six months ended June 29, 2019 were as follows (in thousands):
| June 29, 2019
| Three Months Ended |  | Six Months Ended
Operating lease costs | $ | 1,688 |  |  | $ | 3,453 |
Short-term lease costs | 3 |  |  | 12 |
Sublease income | (52 | ) |  | (104 | )
Total lease cost | $ | 1,639 |  |  | $ | 3,361 |
For the three and six months ended June 30, 2018, rental expense related to operating leases was $1.7 million and $3.5 million, respectively.

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph (a) -Subparagraph (5) + Details
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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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