Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of principal contractual commitments outstanding under our capital leases

The following table summarizes our principal contractual commitments outstanding under our capital leases at December 31, 2017 for the next five years, and in total thereafter (in thousands):

2018	$	398
2019	398
2020	398
2021	398
2022	255
Thereafter	—
Total minimum lease payments	1,847
Less: Amount representing interest	(158		)
Present value of capital lease obligations	1,689
Less current portion of capital lease obligations	(338		)
Total long-term capital lease obligations	$	1,351

Rental expense

Rental expense was as follows for the periods indicated (in thousands):

	Year Ended December 31,
	2017		2016		2015
Rental expense	$	12,073	$	11,314	$	11,168

Long-term non-cancelable operating leases and terminal arrangements for the next five years

At December 31, 2017, rental obligations under non-cancelable operating leases and terminal arrangements with terms in excess of one year for the next five years and thereafter are payable as follows (in thousands):

	2018		2019		2020		2021		2022		Thereafter		Total
Operating leases	$	2,758	$	463	$	68	$	63	$	32	$	23	$	3,407

Schedule of expenses and losses incurred but not reported

We have appropriately recognized estimated expenses and liabilities related to these policies for losses incurred but not reported to us or our insurance carrier. The amount of pre-funded insurance premiums left to cover potential future losses totaled as follows at the dates indicated (in thousands):

	December 31,
	2017		2016
Pre-funded premiums for losses incurred but not reported	$	988	$	2,657

Schedule of accrued medical claims

Medical accrual amounts were as follows at the dates indicated (in thousands):

	December 31,
	2017		2016
Accrued medical claims	$	1,329	$	1,411