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Income taxes - Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Current Federal Tax Expense (Benefit) | $ 18,548 | $ 55,846 | $ 28,856
Current State and Local Tax Expense (Benefit) | 3,007 | 6,075 | 1,634
Current Foreign Tax Expense (Benefit) | 6,539 | 8,219 | 8,058
Current Income Tax Expense (Benefit) | 28,094 | 70,140 | 38,548
Deferred Federal Income Tax Expense (Benefit) | (11,211) | (13,551) | (7,268)
Deferred State and Local Income Tax Expense (Benefit) | (204) | (3,369) | (861)
Deferred Foreign Income Tax Expense (Benefit) | (225) | (333) | 332
Deferred income taxes | (11,640) | (17,253) | (7,797)
Income tax expense | 16,454 | $ 52,887 | $ 30,751
Increase (Decrease) in Income Taxes | $ (36,400) |  |

X
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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 + Details
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