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Income taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Current |  |  |  |  |  |  |  |  |  |  |
U.S. Federal and state |  |  |  |  |  |  |  |  | $ 20,589 | $ 55,591 | $ 34,351
Non-U.S. |  |  |  |  |  |  |  |  | 20,748 | 22,023 | 14,241
Total current |  |  |  |  |  |  |  |  | 41,337 | 77,614 | 48,592
Deferred |  |  |  |  |  |  |  |  |  |  |
U.S. Federal and state |  |  |  |  |  |  |  |  | 16,317 | (4,788) | 386
Non-U.S. |  |  |  |  |  |  |  |  | (1,176) | (1,561) | (1,868)
Total deferred |  |  |  |  |  |  |  |  | 15,141 | (6,349) | (1,482)
Provision for income tax expense | $ 14,107 | $ 13,924 | $ 13,068 | $ 15,379 | $ 10,033 | $ 17,605 | $ 21,742 | $ 21,885 | $ 56,478 | $ 71,265 | $ 47,110

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: 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 + Details
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