Segment and Geographic Information | Note 6—Segment and Geographic Information Segment Information The Company operates its business in one industry, intermodal transportation equipment, and has two operating segments which also represent its reporting segments: • Equipment leasing—the Company owns, leases and ultimately disposes of containers and chassis from its lease fleet. • Equipment trading—the Company purchases containers from shipping line customers, and other sellers of containers, and resells these containers to container retailers and users of containers for storage or one-way shipment. Included in the equipment trading segment revenues are leasing revenues from equipment purchased for resale that is currently on lease until the containers are dropped off. These operating segments were determined based on the chief operating decision maker's review and resource allocation of the products and service offered. The following tables summarize segment information and the consolidated totals reported (in thousands): Three Months Ended September 30, 2018 2017 Equipment Equipment Totals Equipment Equipment Totals Total leasing revenues $ 349,022 $ 1,056 $ 350,078 $ 301,282 $ 838 $ 302,120 Trading margin — 5,810 5,810 — 1,369 1,369 Net gain on sale of leasing equipment 7,055 — 7,055 10,263 — 10,263 Depreciation and amortization expense 141,263 74 141,337 128,428 153 128,581 Interest and debt expense 82,116 386 82,502 73,466 329 73,795 Realized (gain) loss on derivative instruments, net (606 ) (2 ) (608 ) 20 — 20 Income before income taxes (1) $ 104,226 $ 2,862 $ 107,088 $ 73,232 $ 2,079 $ 75,311 (1) Segment income before income taxes excludes unrealized gains or losses on derivative instruments and the write-off of debt costs. Unrealized losses on derivative instruments of $0.3 million and $0.6 million for the three months ended September 30, 2018 and 2017 , respectively. Write-off of debt costs was $1.3 million and $4.1 million for the three months ended September 30, 2018 and 2017 , respectively. Nine Months Ended September 30, 2018 2017 Equipment Equipment Totals Equipment Equipment Totals Total leasing revenues $ 991,639 $ 3,307 $ 994,946 $ 847,136 $ 2,525 $ 849,661 Trading margin — 12,795 12,795 — 3,089 3,089 Net gain on sale of leasing equipment 27,378 — 27,378 25,063 — 25,063 Depreciation and amortization expense 404,927 737 405,664 370,081 471 370,552 Interest and debt expense 235,531 1,096 236,627 206,959 1,117 208,076 Realized (gain) loss on derivative instruments, net (1,345 ) (3 ) (1,348 ) 902 — 902 Income before income taxes (1)(2) $ 310,623 $ 11,682 $ 322,305 $ 173,330 $ 4,257 $ 177,587 (1) Segment income before income taxes excludes unrealized gains or losses on derivative instruments and the write-off of debt costs. Unrealized gains on derivative instruments were $1.0 million and $0.1 million for the nine months ended September 30, 2018 and 2017 , respectively. Write-off of debt costs was $1.9 million and $4.1 million for the nine months ended September 30, 2018 and 2017 , respectively. (2) Equipment leasing segment includes gain on sale of an office building of $21.0 million for the nine months ended September 30, 2018 . September 30, 2018 December 31, 2017 Equipment Equipment Totals Equipment Equipment Totals Equipment held for sale $ 28,602 $ 22,374 $ 50,976 $ 31,534 $ 11,661 $ 43,195 Goodwill 220,864 15,801 236,665 220,864 15,801 236,665 Total assets $ 10,297,814 $ 50,683 $ 10,348,497 $ 9,534,330 $ 43,295 $ 9,577,625 There are no intercompany revenues or expenses between segments. Certain administrative expenses have been allocated between segments based on an estimate of services provided to each segment. A portion of the Company's equipment purchased for resale was purchased through certain sale-leaseback transactions with its shipping line customers. Due to the expected longer term nature of these transactions, these purchases are reflected as leasing equipment as opposed to equipment held for sale and the cash flows associated with these transactions are reflected as purchases of leasing equipment and proceeds from the sale of equipment in investing activities in the Company's consolidated statements of cash flows. Geographic Segment Information The Company generates the majority of its leasing revenues from international containers which are deployed by its customers in a wide variety of global trade routes. The majority of the Company's leasing related revenue is denominated in U.S. dollars. The following table summarizes the geographic allocation of equipment leasing revenues for the three and nine months ended September 30, 2018 and 2017 based on the Company's customers' primary domicile (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Total equipment leasing revenues: Asia $ 142,978 $ 127,205 $ 407,919 $ 361,975 Europe 164,812 133,752 462,943 376,414 Americas 31,796 31,014 92,949 80,464 Bermuda 778 645 2,112 1,037 Other International 9,714 9,504 29,023 29,771 Total $ 350,078 $ 302,120 $ 994,946 $ 849,661 Since the majority of the Company's containers are used internationally, where no one container is domiciled in one particular place for a prolonged period of time, all of the Company's long-lived assets are considered to be international. The following table summarizes the geographic allocation of equipment trading revenues for the three and nine months ended September 30, 2018 and 2017 based on the location of the sale (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Total equipment trading revenues: Asia $ 5,824 $ 6,582 $ 11,539 $ 15,063 Europe 6,475 2,510 15,829 6,728 Americas 10,407 1,973 23,164 5,672 Bermuda — — — 22 Other International 2,586 909 6,234 2,728 Total $ 25,292 $ 11,974 $ 56,766 $ 30,213 |