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Earnings per share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The calculation of basic and diluted earnings per share for each period presented was as follows (dollars and shares in thousands, except per share amounts):
  
Three Months Ended March 31,
 
2016
 
2015
Net income (loss) attributable to common stockholders
$
(22,943
)
 
$
28,672

 
 
 
 
Average shares outstanding (basic)
90,477

 
89,482

Common stock equivalents
—

 
1,987

Diluted shares
90,477

 
91,469

Earnings(losses) per share
 
 
 
Basic earnings (losses) per share
$
(0.25
)
 
$
0.32

Diluted earnings (losses) per share
$
(0.25
)
 
$
0.31