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Summary of significant accounting policies (Earnings per share reconciliation) (Details)
 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
Accounting Policies [Abstract]                      
Diluted earnings per share calculation excluded shares                 300,000 1,000,000 400,000
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]                      
Basic weighted average shares outstanding (in shares) 91,743,000 91,443,000 91,032,000 88,533,000 86,077,000 84,993,000 82,495,000 67,960,000 90,697,000 80,111,000 63,270,000
Dilutive effect of stock option and restricted share plan (in shares)                 3,907,000 6,826,000 4,218,000
Diluted weighted average shares outstanding (in shares) 94,936,000 94,734,000 94,606,000 94,356,000 93,355,000 92,339,000 89,794,000 74,741,000 94,604,000 86,937,000 67,488,000