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Unaudited Quarterly Consolidated Financial Information (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Consolidated Financial Information
 
For the Quarter Ended
 
March 31, 2017
 
June 30, 2017
 
September 30, 2017
 
December 31, 2017
 
(in thousands, except per share data)
Revenues
$
267,907

 
$
313,221

 
$
243,273

 
$
199,112

Gross profit
133,584

 
169,807

 
123,463

 
90,367

Income (loss) from operations
15,582

 
29,446

 
2,685

 
(30,377
)
Net income (loss)
11,010

 
21,960

 
1,629

 
(24,361
)
Net income (loss) attributable to common shareholders
7,155

 
18,086

 
(2,263
)
 
(28,272
)
Basic income (loss) per common share
$
0.08

 
$
0.21

 
$
(0.03
)
 
$
(0.41
)
Diluted income (loss) per common share
$
0.08

 
$
0.20

 
$
(0.03
)
 
$
(0.41
)
 
For the Quarter Ended
 
March 31, 2016
 
June 30, 2016
 
September 30, 2016
 
December 31, 2016
 
(in thousands, except per share data)
Revenues
$
279,140

 
$
323,828

 
$
245,888

 
$
187,417

Gross profit
129,366

 
169,640

 
122,434

 
78,724

Income (loss) from operations
14,243

 
20,605

 
(1,215
)
 
(39,787
)
Net income (loss)
10,146

 
15,537

 
(1,533
)
 
(40,644
)
Net income (loss) attributable to common shareholders
6,361

 
11,735

 
(5,352
)
 
(44,482
)
Basic income (loss) per common share
$
0.07

 
$
0.13

 
$
(0.07
)
 
$
(0.60
)
Diluted income (loss) per common share
$
0.07

 
$
0.13

 
$
(0.07
)
 
$
(0.60
)