Commitments and Contingencies Rental expense, primarily for office premises, amounted to $85.9 million , $89.9 million and $92.7 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. The approximate minimum rental commitments for 2016 and thereafter under non-cancelable leases in effect at December 31, 2015 were as follows (in thousands): 2016 $ 88,177 2017 74,939 2018 56,425 2019 42,763 2020 37,668 Thereafter 81,437 $ 381,409 On April 23, 2010, Plaintiffs David Opalinski and James McCabe, on behalf of themselves and a putative class of similarly situated Staffing Managers, filed a Complaint in the United States District Court for the District of New Jersey naming the Company and one of its subsidiaries as Defendants. The Complaint alleges that salaried Staffing Managers located throughout the U.S. have been misclassified as exempt from the Fair Labor Standards Acts overtime pay requirements. Plaintiffs seek an unspecified amount for unpaid overtime on behalf of themselves and the class they purport to represent. Plaintiffs also seek an unspecified amount for statutory penalties, attorneys fees and other damages. On October 6, 2011, the Court granted the Companys motion to compel arbitration of the Plaintiffs allegations. At this stage, it is not feasible to predict the outcome of or a range of loss, should a loss occur, from these allegations and, accordingly, no amounts have been provided in the Companys financial statements. The Company believes it has meritorious defenses to the allegations, and the Company intends to continue to vigorously defend against the allegations. On March 13, 2014, Plaintiff Leonor Rodriguez, on her own behalf and on behalf of a putative class of allegedly similarly situated individuals, filed a complaint against the Company in the Superior Court of California, San Diego County. The complaint alleges that a putative class of current and former employees of the Company working in California since March 13, 2011 were denied compensation for the time they sp