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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Summary of Unaudited Quarterly Financial Information

 

 

 

1st

 

 

2nd

 

 

3rd

 

 

4th

 

 

 

Quarter

 

 

Quarter

 

 

Quarter

 

 

Quarter

 

2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Operating revenues

 

$

305,175

 

 

$

579,186

 

 

$

684,989

 

 

$

787,334

 

Operating loss

 

 

(92,639

)

 

 

(140,236

)

 

 

(38,016

)

 

 

(21,647

)

Net income (loss)

 

 

(63,539

)

 

 

(92,184

)

 

 

(33,769

)

 

 

195,402

 

Net income (loss) per common share:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Basic

 

$

(0.40

)

 

$

(0.46

)

 

$

(0.16

)

 

$

0.88

 

Diluted

 

$

(0.40

)

 

$

(0.46

)

 

$

(0.16

)

 

$

0.88

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2016

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Operating revenues

 

$

268,939

 

 

$

193,907

 

 

$

206,133

 

 

$

246,887

 

Operating loss

 

 

(95,259

)

 

 

(124,332

)

 

 

(123,409

)

 

 

(113,226

)

Net loss

 

 

(70,503

)

 

 

(85,866

)

 

 

(84,143

)

 

 

(78,122

)

Net loss per common share:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Basic

 

$

(0.48

)

 

$

(0.58

)

 

$

(0.58

)

 

$

(0.53

)

Diluted

 

$

(0.48

)

 

$

(0.58

)

 

$

(0.58

)

 

$

(0.53

)