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Summarized Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
Summarized quarterly financial information is as follows:
2016
 
1st
 
2nd
 
3rd
 
4th
 
 
(in thousands, except per share data)
 
Quarter
 
Quarter
 
Quarter
 
Quarter
 
Total
 
 
 
 
 
 
 
 
 
 
 
Operating revenues
 
$
209,498

 
$
227,817

 
$
233,040

 
$
272,692

 
$
943,047

Costs and expenses
 
(186,228
)
 
(189,699
)
 
(190,797
)
 
(190,549
)
 
(757,273
)
Depreciation and amortization of intangibles
 
(14,411
)
 
(14,786
)
 
(14,892
)
 
(14,492
)
 
(58,581
)
Impairment of goodwill and intangibles
 
—

 
—

 
—

 
—

 
—

Gains (losses), net on disposal of property and equipment
 
4

 
(22
)
 
(26
)
 
(499
)
 
(543
)
Interest expense
 
(4,579
)
 
(4,432
)
 
(4,592
)
 
(4,436
)
 
(18,039
)
Miscellaneous, net
 
(191
)
 
(458
)
 
(596
)
 
(1,401
)
 
(2,646
)
Income from continuing operations before income taxes
 
4,093

 
18,420

 
22,137

 
61,315

 
105,965

Provision (benefit) for income taxes
 
(795
)
 
6,932

 
9,615

 
22,978

 
38,730

Income from continuing operations, net of tax
 
4,888

 
11,488

 
12,522

 
38,337

 
67,235

Income (loss) from discontinued operations, net of tax
 
—

 
—

 
—

 
—

 
—

Net income
 
$
4,888

 
$
11,488

 
$
12,522

 
$
38,337

 
$
67,235

Net income from continuing operations per basic share of common stock
 
$
0.06

 
$
0.14

 
$
0.15

 
$
0.46

 
$
0.80

Net income (loss) from discontinued operations per basic share of common stock
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Net income from continuing operations per diluted share of common stock
 
$
0.06

 
$
0.13

 
$
0.15

 
$
0.46

 
$
0.79

Net income (loss) from discontinued operations per diluted share of common stock
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Weighted average shares outstanding:
 
 
 
 
 
 
 
 
 
 
Basic
 
83,965

 
83,773

 
83,230

 
82,401

 
83,339

Diluted
 
84,225

 
84,051

 
83,518

 
82,684

 
83,639

Cash dividends per share of common stock
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—


2015
 
1st
 
2nd
 
3rd
 
4th
 
 
(in thousands, except per share data)
 
Quarter
 
Quarter
 
Quarter
 
Quarter
 
Total
 
 
 
 
 
 
 
 
 
 
 
Operating revenues
 
$
123,023

 
$
198,134

 
$
189,691

 
$
204,808

 
$
715,656

Costs and expenses
 
(124,214
)
 
(200,209
)
 
(173,962
)
 
(223,095
)
 
(721,480
)
Depreciation and amortization of intangibles
 
(8,295
)
 
(13,366
)
 
(16,273
)
 
(14,018
)
 
(51,952
)
Impairment of goodwill and intangibles
 
—

 
—

 
(24,613
)
 
—

 
(24,613
)
(Losses) gains, net on disposal of property and equipment
 
(164
)
 
(215
)
 
(200
)
 
96

 
(483
)
Interest expense
 
(2,052
)
 
(4,225
)
 
(4,246
)
 
(4,576
)
 
(15,099
)
Miscellaneous, net
 
(1,436
)
 
387

 
1,061

 
(1,433
)
 
(1,421
)
Loss from continuing operations before income taxes
 
(13,138
)
 
(19,494
)
 
(28,542
)
 
(38,218
)
 
(99,392
)
Benefit for income taxes
 
(5,023
)
 
(6,539
)
 
(4,099
)
 
(17,094
)
 
(32,755
)
Loss from continuing operations, net of tax
 
(8,115
)
 
(12,955
)
 
(24,443
)
 
(21,124
)
 
(66,637
)
Income (loss) from discontinued operations, net of tax
 
3,015

 
(18,448
)
 
—

 
(407
)
 
(15,840
)
Net loss
 
$
(5,100
)
 
$
(31,403
)
 
$
(24,443
)
 
$
(21,531
)
 
$
(82,477
)
Net loss from continuing operations per basic share of common stock
 
$
(0.14
)
 
$
(0.15
)
 
$
(0.29
)

$
(0.25
)
 
$
(0.86
)
Net income (loss) from discontinued operations per basic share of common stock
 
$
0.05

 
$
(0.22
)
 
$
—


$
—

 
$
(0.20
)
Net loss from continuing operations per diluted share of common stock
 
$
(0.14
)
 
$
(0.15
)
 
$
(0.29
)

$
(0.25
)
 
$
(0.86
)
Net income (loss) from discontinued operations per diluted share of common stock
 
$
0.05

 
$
(0.22
)
 
$
—


$
—

 
$
(0.20
)
Weighted average shares outstanding:
 
 
 
 
 
 
 
 
 
 
Basic
 
57,335

 
83,903

 
84,107

 
83,775

 
77,373

Diluted
 
57,335

 
83,903

 
84,107

 
83,775

 
77,373

Cash dividends per share of common stock
 
$
—

 
$
1.03

 
$
—

 
$
—

 
$
1.03