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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table presents the calculation of basic and diluted EPS: 
 
 
Year Ended December 31,
 
 
2014
 
2013
 
2012
 
 
(in thousands, except per share amounts)
Weighted average shares - basic
 
86,693

 
85,682

 
82,285

Dilutive effect of stock awards
 
813

 
859

 
627

Weighted average shares - diluted
 
87,506

 
86,541

 
82,912

Net income available to common stockholders
 
$
146,564

 
$
113,555

 
$
68,846

Earnings per share - basic
 
1.69

 
1.33

 
0.84

Earnings per share - diluted
 
1.67

 
1.31

 
0.83