Commitments and Contingencies

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

At December 31, 2015, we were obligated under various operating lease agreements. Rental expense in 2015, 2014 and 2013 was $10.5 million, $10.7 million and 10.3 million, respectively.

At December 31, 2015, future minimum rental payments under non-cancelable operating leases were:



Year	($ in millions)
2016	$	9.6
2017	7.3
2018	5.8
2019	4.1
2020	3.5
Thereafter	27.9
Total	$	58.2

At December 31, 2015, outstanding unconditional contractual commitments for the purchase of raw materials and equipment amounted to $10.7 million, of which $10.4 million is due to be paid in 2016.

We have letters of credit totaling $3.0 million supporting the reimbursement of workers' compensation and other claims paid on our behalf by insurance carriers. Our accrual for insurance obligations was $8.2 million at December 31, 2015, of which $4.1 million is in excess of our deductible and, therefore, is reimbursable by the insurance company.

Our SmartDose contingent consideration is payable to the selling shareholders based upon a percentage of product sales over the life of the underlying product patent, which is 17 years, with no cap on total payments. Given the length of the earnout period and the uncertainty in forecasted product sales, we do not believe it is meaningful to estimate the upper end of the range over the entire period. However, our estimated probable range which could become payable over the next five years is between zero and $6.0 million.