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Lease Commitments | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Lease Commitments | Lease Commitments The approximate future minimum rental commitments, exclusive of taxes and other related charges, for all significant non-cancellable operating leases at December 31, 2017, are summarized as follows (in thousands):
Year ending December 31, |
2018 | $ | 8,032 |
2019 | 7,511 |
2020 | 6,980 |
2021 | 4,854 |
2022 | 3,378 |
Thereafter | 14,578 |
| $ | 45,333 |
Rental expense was $8.8 million, $8.7 million and $8.9 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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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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