The Company's contractual commitments are as follows for years ending December 31 (in thousands):



	2016		2017		2018		2019		2020		Thereafter		Total
Operating lease commitments	$	3,871	$	3,945	$	4,026	$	4,105	$	3,795	$	6,098	$	25,840
Purchase commitments	3,082		3,002		2,530		—		—		—		8,614
Debt commitments	33,200		32,560		20,640		221,250		10,000		290,000		607,650
Interest on Notes	8,553		8,553		8,553		4,277		—		—		29,936
Acquisition-related contingent consideration liability	—		723		962		1,266		—		—		2,951
Total	$	48,706	$	48,783	$	36,711	$	230,898	$	13,795	$	296,098	$	674,991

Operating lease commitments: The Company has non-cancelable operating leases for its facilities. The leases run through 2023, and some of the leases have clauses for optional renewal. Rent expense under operating leases totaled $1.2 million, $1.2 million, and $0.9 million for the years ended December 31, 2015, 2014, and 2013, respectively.

Purchase commitments: The Company's purchase commitments consist primarily of non-cancelable service agreements for its data centers and a sponsorship marketing agreement.

Debt commitments and interest on Notes: The Company’s debt commitments are based upon contractual payment terms and consist of the outstanding principal related to the TaxAct - HD Vest credit facility, the Notes, and the note payable with related party. The Company may repay the amounts outstanding under the TaxAct - HD Vest credit facility before its maturity date, depending upon the cash generated by the businesses, and under the Notes based upon holders exercising their conversion option. For further detail regarding the credit facility, the Notes, and the note payable with related party, see "Note 8: Debt."

Acquisition-related contingent consideration liability: The contingent consideration liability is related to the Company's acquisition of SimpleTax (see "Note 3: Business Combinations" and "Note 6: Fair Value Measurements"), and the related payments are expected to occur annually beginning in 2017 and continuing through 2019.

Collateral pledged: The Company has pledged a portion of its cash as collateral for certain of its property lease-related banking arrangements. At December 31, 2015, the total amount of collateral pledged under these standby letters of credit was $0.7 million.

Off-balance sheet arrangements: The Company has no off-balance sheet arrangements other than operating leases.

Litigation: From time to time, the Company is subject to various legal proceedings or claims that arise in the ordinary course of business. Following is a brief description of the more significant legal proceedings. The Company accrues a liability when management believes that it is both probable that a liability has been incurred and the amount of loss can be reasonably estimated. Although the Company believes that resolving claims against it, individually or in aggregate, will not have a material adverse impact on its financial statements, these matters are subject to inherent uncertainties.

On March 5, 2015, Remigius Shatas filed a shareholder derivative action against Andrew Snyder, a director of the Company, certain companies affiliated with Mr. Snyder, as well as nominal defendant Blucora, in the Superior Court of the State of Washington in and for King County. Although the Company is a nominal defendant, the plaintiff purports to bring the action on behalf of the Company and thus does not seek monetary damages from the Company. Instead, the plaintiff alleges improper use of inside information in certain sales of the Company's common stock and seeks to recover from Andrew Snyder and those companies affiliated with Mr. Snyder profits resulting from those allegedly improper sales. On May 15, 2015, the court granted the Company's motion to dismiss the Complaint based on the plaintiffs’ failure to file this matter in the proper court. Subsequently, the plaintiff moved for reconsideration of the Superior Court's decision to grant the motion to dismiss, and on June 5, 2015, that motion for reconsideration was denied. On June 30, 2015, the plaintiff filed a Notice of Appeal with the Superior Court, indicating plaintiff's intention to appeal to the Washington Court of Appeals, Division I. On September 14, 2015, the plaintiff filed a motion with the Washington Court of Appeals to add an additional plaintiff, which the court subsequently denied on October 19, 2015. Plaintiff filed its appellant brief on September 25, 2015, and the Company filed its response on October 26, 2015, as well as a Motion on the Merits to Affirm on the grounds that the plaintiff lacked standing at all points relevant to the lawsuit. The plaintiff filed a reply brief in support of its Appeal on November 25, 2015. The plaintiff filed its opposition to the Company’s Motion on the Merits on November 5, 2015. The court denied the Company’s motion on November 9, 2015, on procedural, not substantive, grounds. The Company refiled the substance of the motion in a Motion to Dismiss Appeal on November 10, 2015, and the plaintiff filed its opposition on December 1, 2015. The Company filed a reply brief on December 7, 2015. The Company awaits the court’s decision with respect to the plaintiff’s appeal as well as the Company’s motion to dismiss.

The Company has entered into indemnification agreements in the ordinary course of business with its officers and directors and may be obligated to advance payment of legal fees and costs incurred by the defendants pursuant to the Company’s obligations under these indemnification agreements and applicable Delaware law.