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Leases (Tables) | 12 Months Ended
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Dec. 31, 2015
Leases [Abstract] |
Future minimum rental payments under non cancelable operating leases | We lease various office facilities, equipment and vehicles under operating lease arrangements, some of which contain rent escalation clauses. Most of the leases contain purchase and/or renewal options at fair market and fair rental value, respectively. Rental expense relating to all operating leases was $13.6 million, $13.4 million and $13.9 million in 2015, 2014 and 2013, respectively. At December 31, 2015, future minimum rental payments under noncancelable operating leases are as follows:
|  | Operating Leases
|  | (in thousands)
2016 |  | $ | 13,961 |
2017 |  | 11,196 |
2018 |  | 9,423 |
2019 |  | 6,366 |
2020 |  | 4,200 |
Thereafter |  | 3,312 |
Total minimum lease payments |  | $ | 48,458 |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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