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Income tax expense (Tables)
3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
 
Three months ended
(dollars in thousands)
March 31,
2015
 
March 31,
2014
Income tax expense
$
3,272

 
$
3,882

Effective tax rate
16.3
%
 
26.0
%