12. Commitments, Contingencies and Guarantees

At December 31, 2015, minimum rental commitments under non-cancellable leases are

approximately as follows:


	Minimum Rental Commitments
Year Ending December 31	Capital		Operating
2016		9,746		9,526
2017		2,652		8,532
2018		628		7,484
2019		—		5,891
2020		—		4,789
Thereafter		—		601
Total minimum lease payments	$	13,026	$	36,823

Total operating lease expense, net of amortization expense related to landlord incentives, for the years ended December 31, 2015, 2014 and 2013 was approximately $5.3 million, $3.5 million, and $4.3 million, respectively. Occupancy lease expense for the years ended December 31, 2015, 2014 and 2013 of $3.9 million, $1.7 million and $1.9 million, respectively, is included within operations and administrative expenses in the consolidated statements of comprehensive income. Communication equipment lease expense for the years ended December 31, 2015, 2014 and 2013 of $1.4 million, $1.8 million and $2.4 million, respectively, is included within communication and data processing in the accompanying consolidated statements of comprehensive income.

Employee Retention Plan

In connection with the July 8, 2011 acquisition of MTH, the Company established an employee retention plan. Under the plan, approximately $21.5 million was paid to employees in five installments from July 8, 2011 through July 8, 2014. The Company recognized approximately $0, $2.6 million and $6.7 million, respectively, in compensation expense related to the plan, for the years ended December 31, 2015, 2014 and 2013, in acquisition related retention bonus in the accompanying consolidated statements of comprehensive income.

Litigation

The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. The Company has also been, is currently, and may in the future be, the subject of one or more regulatory or self-regulatory organization enforcement actions, including but not limited to targeted and routine regulatory inquiries and investigations involving Regulation NMS, Regulation SHO, capital requirements and other domestic and foreign securities rules and regulations which may from time to time result in the imposition of penalties or fines. The Company has also been the subject of requests for information and documents from the SEC and the State of New York Office of the Attorney General (‘‘NYAG’’). Certain of these matters may result, or have resulted, in adverse judgments, settlements, fines, penalties, injunctions or other relief, and the Company’s business or reputation could be negatively impacted if it were determined that disciplinary or other enforcement actions were required. The ultimate effect on the Company from the pending proceedings and claims, if any, is presently unknown. Where available information indicates that it is probable a liability had been incurred at the date of the consolidated financial statements and the Company can reasonably estimate the amount of that loss, the Company accrues the estimated loss by a charge to income. In addition, in December 2015 the enforcement committee of the Autorité des marchés financiers (“AMF”) fined our European subsidiary in the amount of €5.0 million (approximately $5.4 million) based on its allegations that the subsidiary of MTH engaged in price manipulation and violations of the AMF General Regulation and Euronext Market Rules. In accordance with the foregoing, we have accrued an estimated loss of €5.0 million (approximately $5.4 million) in relation to the fine imposed by the AMF. Subject to the foregoing, based on information currently available, management believes it is not probable that the resolution of any known matters will result in a material adverse effect on the Company’s financial position, results of operations or cash flows although they might be material for any particular reporting period. The Company’s management believes that the relevant trading engaged in by the subsidiary of MTH was conducted in accordance with applicable French law and regulations and the Company is pursuing its rights of appeal.

Indemnification Arrangements

Consistent with standard business practices in the normal course of business, the Company has provided general indemnifications to its managers, officers, employees, and agents against expenses, judgments, fines, settlements, and other amounts actually and reasonably incurred by such persons under certain circumstances as more fully disclosed in its operating agreement. The overall maximum amount of the obligations (if any) cannot reasonably be estimated as it will depend on the facts and circumstances that give rise to any future claims.