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Financial Results by Quarter (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information

 

 

Three Months Ended

 

 

 

March 31

 

 

June 30

 

 

September 30

 

 

December 31

 

(Dollars in thousands, except per share amounts)

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Revenues

 

$

199,897

 

 

$

149,681

 

 

$

268,233

 

 

$

163,229

 

 

$

289,199

 

 

$

190,441

 

 

$

217,250

 

 

$

175,244

 

Operating income

 

$

27,831

 

 

$

25,815

 

 

$

69,417

 

 

$

42,059

 

 

$

77,742

 

 

$

45,389

 

 

$

9,964

 

 

$

38,644

 

Net income

 

$

14,597

 

 

$

16,921

 

 

$

46,148

 

 

$

24,244

 

 

$

60,336

 

 

$

33,700

 

 

$

1,799

 

 

$

11,588

 

Net income per share1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Basic

 

$

0.29

 

 

$

0.41

 

 

$

0.73

 

 

$

0.59

 

 

$

0.96

 

 

$

0.83

 

 

$

0.03

 

 

$

0.28

 

Diluted

 

$

0.29

 

 

$

0.41

 

 

$

0.73

 

 

$

0.59

 

 

$

0.93

 

 

$

0.82

 

 

$

0.03

 

 

$

0.28

 

 

1

Per share amounts are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the total computed for the year.