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Comprehensive income (Tables) | 6 Months Ended
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Jun. 30, 2017
Statement of Comprehensive Income [Abstract] |
Comprehensive income |
| For the three months ended June 30, 2017 |  | For the six months ended June 30, 2017
| Interest rate cap agreements |  | Investment securities |  | Foreign currency translation adjustments |  | Accumulated other comprehensive (loss) income |  | Interest rate cap agreements |  | Investment securities |  | Foreign currency translation adjustments |  | Accumulated other comprehensive (loss) income
Beginning balance | $ | (13,952 | ) |  | $ | 3,594 |  |  | $ | (66,528 | ) |  | $ | (76,886 | ) |  | $ | (12,029 | ) |  | $ | 2,175 |  |  | $ | (79,789 | ) |  | $ | (89,643 | )
Unrealized (losses) gains | (2,969 | ) |  | 1,446 |  |  | 49,142 |  |  | 47,619 |  |  | (8,186 | ) |  | 3,428 |  |  | 62,403 |  |  | 57,645 |
Related income tax benefit (expense) | 1,154 |  |  | (389 | ) |  | — |  |  | 765 |  |  | 3,184 |  |  | (812 | ) |  | — |  |  | 2,372 |
| (1,815 | ) |  | 1,057 |  |  | 49,142 |  |  | 48,384 |  |  | (5,002 | ) |  | 2,616 |  |  | 62,403 |  |  | 60,017 |
Reclassification from accumulated other comprehensive income into net income | 2,070 |  |  | (117 | ) |  | — |  |  | 1,953 |  |  | 4,139 |  |  | (346 | ) |  | — |  |  | 3,793 |
Related income tax (expense) benefit | (805 | ) |  | 46 |  |  | — |  |  | (759 | ) |  | (1,610 | ) |  | 135 |  |  | — |  |  | (1,475 | )
| 1,265 |  |  | (71 | ) |  | — |  |  | 1,194 |  |  | 2,529 |  |  | (211 | ) |  | — |  |  | 2,318 |
Ending balance | $ | (14,502 | ) |  | $ | 4,580 |  |  | $ | (17,386 | ) |  | $ | (27,308 | ) |  | $ | (14,502 | ) |  | $ | 4,580 |  |  | $ | (17,386 | ) |  | $ | (27,308 | )
| For the three months ended June 30, 2016 |  | For the six months ended June 30, 2016
| Interest rate cap and swap agreements |  | Investment securities |  | Foreign currency translation adjustments |  | Accumulated other comprehensive (loss) income |  | Interest rate cap and swap agreements |  | Investment securities |  | Foreign currency translation adjustments |  | Accumulated other comprehensive (loss) income
Beginning balance | $ | (15,929 | ) |  | $ | 1,497 |  |  | $ | (39,081 | ) |  | $ | (53,513 | ) |  | $ | (10,925 | ) |  | $ | 1,361 |  |  | $ | (50,262 | ) |  | $ | (59,826 | )
Unrealized (losses) gains | (4,283 | ) |  | 782 |  |  | (4,844 | ) |  | (8,345 | ) |  | (13,234 | ) |  | 1,124 |  |  | 6,337 |  |  | (5,773 | )
Related income tax benefit (expense) | 1,667 |  |  | (293 | ) |  | — |  |  | 1,374 |  |  | 5,149 |  |  | (406 | ) |  | — |  |  | 4,743 |
| (2,616 | ) |  | 489 |  |  | (4,844 | ) |  | (6,971 | ) |  | (8,085 | ) |  | 718 |  |  | 6,337 |  |  | (1,030 | )
Reclassification from accumulated other comprehensive income into net income | 733 |  |  | — |  |  | — |  |  | 733 |  |  | 1,494 |  |  | (152 | ) |  | — |  |  | 1,342 |
Related income tax (expense) benefit | (285 | ) |  | — |  |  | — |  |  | (285 | ) |  | (581 | ) |  | 59 |  |  | — |  |  | (522 | )
| 448 |  |  | — |  |  | — |  |  | 448 |  |  | 913 |  |  | (93 | ) |  | — |  |  | 820 |
Ending balance | $ | (18,097 | ) |  | $ | 1,986 |  |  | $ | (43,925 | ) |  | $ | (60,036 | ) |  | $ | (18,097 | ) |  | $ | 1,986 |  |  | $ | (43,925 | ) |  | $ | (60,036 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- References No definition available. + Details
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