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Segment Information - Reconciliation of Adjusted Operating Income to Income Before Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Adjusted operating income | $ 163,590 | $ 133,200 | $ 470,882 | $ 379,312
Stock-based compensation |  |  | 24,657 | 22,354
Impairment charges | 2,424 | 0 | 2,424 | 16,175
Operating income | 100,688 | 63,723 | 281,961 | 172,056
Financing interest expense | (25,718) | (25,754) | (78,560) | (81,449)
Net foreign currency (loss) gain | (1,094) | 14,611 | (27,438) | 33,578
Net unrealized gain (loss) on financial instruments | 2,157 | (150) | 18,371 | (849)
Income before income taxes | 76,033 | 52,430 | 194,334 | 123,336
Fleet Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted operating income | 113,731 | 92,698 | 329,364 | 267,718
Travel and corporate solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted operating income | 39,377 | 28,995 | 99,074 | 69,697
Health and Employee Benefit Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted operating income | 10,482 | 11,507 | 42,444 | 41,897
Segment reconciling items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Unallocated corporate expenses | 13,414 | 12,935 | 42,378 | 38,056
Acquisition-related intangible amortization | 33,439 | 38,510 | 103,596 | 114,603
Other acquisition and divestiture related items | 1,536 | 1,006 | 2,792 | 3,380
Debt restructuring costs | 317 | 2,519 | 3,798 | 2,519
Stock-based compensation | 9,799 | 8,483 | 25,659 | 22,354
Restructuring and other costs | 1,973 | 6,024 | 8,274 | 10,169
Impairment charges | $ 2,424 | $ 0 | $ 2,424 | $ 16,175

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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