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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Earnings Per Share
The computation of basic and diluted earnings per share is as follows:
 
 
Years Ended December 31,
 
2016
 
2015
 
2014
($ in thousands, except per share amounts)
 
 
 
 
 
Net Income
$
48,763

 
$
30,671

 
$
96,965

Noncontrolling interests
(261
)
 
4,435

 
735

Net Income Attributable to Common Stockholders
$
48,502

 
$
35,106

 
$
97,700

Shares:
 
 
 
 
 
Basic: Weighted-average number of shares outstanding
7,648

 
8,797

 
9,091

Plus: Incremental shares from assumed conversion of dilutive instruments
174

 
163

 
201

Diluted: Weighted-average number of shares outstanding
7,822

 
8,960

 
9,292

Earnings per share—basic
$
6.34

 
$
3.99

 
$
10.75

Earnings per share—diluted
$
6.20

 
$
3.92

 
$
10.51