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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Calculation of Basic and Diluted EPS
The calculations of basic and diluted EPS are as follows ($ in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
16,821

 
$
(10,530
)
 
$
38,638

 
$
17,109

Non-cash dividend to warrant holders
—

 
(879
)
 
—

 
(879
)
Preferred Share dividends
—

 
—

 
—

 
(7,922
)
Allocation of undistributed earnings to preferred shareholders
—

 
—

 
—

 
(1,359
)
Numerator for basic EPS - income (loss) available to ordinary shareholders
16,821

 
(11,409
)
 
38,638

 
6,949

Add back Preferred Share dividends (1)
—

 
—

 
—

 
—

Add back undistributed earnings to preferred shareholders (1)
—

 
—

 
—

 
—

Numerator for diluted EPS - income (loss) available to ordinary shareholders after assumed conversions
$
16,821

 
$
(11,409
)
 
$
38,638

 
$
6,949

Denominator:

 

 
 
 
 
Denominator for basic EPS - weighted-average shares
116,987,887

 
104,064,220

 
113,685,219

 
83,275,443

Effect of dilutive securities:
 
 
 
 
 
 
 
Unvested restricted share awards
337,336

 
—

 
296,544

 
14,441

Preferred Shares
—

 
—

 
—

 
—

Denominator for diluted EPS - adjusted weighted-average shares
117,325,223

 
104,064,220

 
113,981,763

 
83,289,884

 
 
 
 
 
 
 
 
EPS - Basic
$
0.14

 
$
(0.11
)
 
$
0.34

 
$
0.08

EPS - Diluted
$
0.14

 
$
(0.11
)
 
$
0.34

 
$
0.08

    ________
(1) For the six months ended June 30, 2017, Preferred Share dividends of our Predecessor of $7.9 million and the preferred shareholders’ allocation of undistributed earnings of our Predecessor of $1.4 million were not added back for purposes of calculating diluted EPS because the effect of treating our Predecessor's Preferred Shares as if they had been converted to their 15,927,778 ordinary share equivalents as of January 1, 2017 was anti-dilutive.