ommitments and Contingencies

Contractual Obligations

The Company leases facilities and certain equipment under agreements accounted for as operating leases. These leases generally require the Company to pay all executory costs such as maintenance and insurance. Rental expense for operating leases for the years ended December 31, 2018, 2017, and 2016 was approximately $10.9 million, $9.9 million and $10.0 million, respectively.

Future minimum lease payments under non-cancellable operating leases (with an initial or remaining lease terms in excess of one year) are as follows (amounts in thousands):



Year Ending December 31,	Operating Leases
2019	$	8,488
2020	6,139
2021	5,477
2022	2,649
2023	883
Thereafter	61
Total minimum lease payments	$	23,697

Our other noncurrent liabilities in the consolidated balance sheet include unrecognized tax benefits. As of December 31, 2018, we had gross unrecognized tax benefits of $1.9 million. At this time, we are unable to make a reasonably reliable estimate of the timing of payments in individual years in connection with these tax liabilities; therefore, such amounts are not included in the above contractual obligation table.

Employee Benefit Plans

The Company has a 401(k) defined contribution plan covering all eligible employees. The Company provides for employer matching contributions equal to 50% of employee contributions, up to the lesser of 5% of eligible compensation or $6,000. Matching contributions are deposited into the employees 401(k) account and are subject to 5 year graded vesting. Total Company matching contributions were $1.6 million, $1.4 million, and $1.3 million for the years ended for the year ended December 31, 2018, 2017 and 2016, respectively.

Indemnifications

The Company enters into service and license agreements in its ordinary course of business. Pursuant to some of these agreements, the Company agrees to indemnify certain customers from and against certain types of claims and losses suffered or incurred by them as a result of using the Company’s products.

The Company also has agreements whereby its executive officers and directors are indemnified for certain events or occurrences while the officer or director is, or was serving, at the Company’s request in such capacity. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited; however, the Company has a directors and officers insurance policy that reduces its exposure and enables the Company to recover a portion of any future amounts paid. As a result of its insurance policy coverage, the Company believes the estimated fair value of these indemnification agreements is minimal. Currently, the Company has no liabilities recorded for these agreements as of December 31, 2018.

Letters of Credit

As of December 31, 2018, the Company has a $1.8 million letter of credit outstanding substantially in favor of a certain landlord for office space. In addition, the Company has a letter of credit totaling $0.1 million as a security deposit for the due performance by the Company of the terms and conditions of a supply contract. There were no draws against these letters of credit during the year ended December 31, 2018.