Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Schedule of rent expense associated with operating leases

The table below presents rent expenses associated with facility, vehicle and equipment operating leases for the past three years (in thousands):

2016		2015		2014
$	63,940	$	60,129	$	60,214

Future minimum lease payments related to non-cancelable operating leases

The table below sets forth the approximate future minimum lease payments as of December 31, 2016 related to non-cancelable facility operating leases and the non-cancelable portion of certain equipment operating leases with initial terms of one year or more (in thousands):

2017	$	47,324
2018	39,908
2019	33,088
2020	26,211
2021	15,955
Thereafter	19,890