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Leases | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Leases | Leases Rental expense for operating leases was $19.3 million, $18.2 million, and $18.1 million for the years ended December 31, 2017, 2016, and 2015, respectively. Sublease rental income was not material in any of the periods presented. As of December 31, 2017, our minimum lease payment requirements for noncancelable operating leases with terms of more than one year are as follows (in thousands):
2018 |  | $ | 15,137 |
2019 |  | 14,538 |
2020 |  | 14,185 |
2021 |  | 12,635 |
2022 |  | 11,129 |
Thereafter |  | 58,658 |
Total |  | $ | 126,282 |
These future minimum lease payment requirements have not been reduced by sublease income due in the future under noncancelable subleases. Minimum sublease income expected to be received in the future is not material.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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