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Segment Information - Reconciliation of Adjusted Operating Income to Income Before Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Adjusted operating income | $ 184,561 | $ 159,009 | $ 331,703 | $ 310,302
Stock-based compensation |  |  | 24,861 | 15,860
Operating income | 94,737 | 100,424 | 163,672 | 184,283
Financing interest expense | (35,638) | (25,505) | (66,750) | (52,842)
Net foreign currency gain (loss) | 6,665 | (26,734) | 2,780 | (26,344)
Net unrealized gains on financial instruments | (21,516) | 2,706 | (33,428) | 16,214
Income before income taxes | 44,248 | 50,891 | 66,274 | 121,311
Fleet Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted operating income | 122,577 | 112,953 | 215,552 | 220,926
Travel and corporate solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted operating income | 40,838 | 34,448 | 75,225 | 59,697
Health and Employee Benefit Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted operating income | 21,146 | 11,608 | 40,926 | 29,679
Segment reconciling items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Unallocated corporate expenses | 18,177 | 15,044 | 35,119 | 28,964
Acquisition-related intangible amortization | 39,814 | 34,921 | 73,702 | 70,157
Other acquisition and divestiture related items | 7,017 | 619 | 16,797 | 1,256
Debt restructuring costs | 5,078 | 466 | 9,478 | 3,481
Stock-based compensation | 14,992 | 6,905 | 25,434 | 15,860
Restructuring and other costs | $ 4,746 | $ 630 | $ 7,501 | $ 6,301

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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=118932676&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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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 + Details
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