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Earnings per share (Details) - shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 473,000  
Weighted Average Number of Shares Outstanding Reconciliation    
Weighted average number of common shares outstanding used to compute basic earnings per share 53,147,000 51,519,000
Dilutive effect of stock-based awards 497,000 690,000
Number of shares used to compute diluted earnings per share 53,644,000 52,209,000