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Equity and EPS (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The computations of basic and diluted EPS:

Year Ended December 31,
 
2017
 
2016
 
2015
Operations:
 
 
 
 


Net income(a)
$
41,823

 
$
31,184

 
$
26,191

Less: Income attributable to participating securities (unvested shares and units) (b)
996

 
954

 
873

Net income attributable to common shareholders
$
40,827

 
$
30,230

 
$
25,318


 
 
 
 
 
Share information:
 
 
 
 
 
Basic and diluted weighted average common shares(c)(d)
16,746,731

 
16,643,811

 
17,123,556


 
 
 
 


Basic and diluted EPS(d)
$
2.44


$
1.82


$
1.48


(a) 
Net income attributable to all shareholders.
(b) 
Participating securities included unvested restricted stock of 0, 0, and 128,500 for the years ended December 31, 2017, 2016, and 2015, as well as RSUs of 368,492, 527,486, and 437,946 for the years ended December 31, 2017, 2016, and 2015, respectively.
(c) 
Under the two class method, basic weighted average common shares exclude outstanding unvested participating securities.
(d) 
Basic and diluted weighted average common shares were affected by the September 1, 2015, purchase of 950,000 shares of common stock in a privately negotiated transaction with F2 SEA, Inc., an affiliate of SEACOR Holdings, Inc., pursuant to a Stock Repurchase Agreement. SEACOR Holdings, Inc. was the 70 percent owner of ICP, the Company's 30 percent equity method investment until it was sold on July 3, 2017 (Note 3).
Schedule of Accumulated Other Comprehensive Income (Loss)
Changes in Accumulated Other Comprehensive Income (Loss) by Component:


Pension Plan Items
(a) 
Post-Employment Benefit Plan Items

Other

Total
Balance, December 31, 2014
 
$
(244
)

$
(456
)

$
(32
)

$
(732
)
   Other comprehensive income (loss) before reclassifications
 
(355
)
 
47

 
(10
)
 
(318
)
Amounts reclassified from accumulated other comprehensive income
 
599

 
(101
)
 
52

 
550

Net 2015 other comprehensive income (loss)
 
244

 
(54
)
 
42

 
232

Balance, December 31, 2015
 
$
—

 
$
(510
)
 
$
10

 
$
(500
)
   Other comprehensive income (loss) before reclassifications
 
—

 
113

 
(14
)
 
99

Amounts reclassified from accumulated other comprehensive income
 
—

 
21

 
7

 
28

Net 2016 other comprehensive income (loss)
 
—

 
134

 
(7
)
 
127

Balance, December 31, 2016
 
$
—

 
$
(376
)
 
$
3

 
$
(373
)
   Other comprehensive income (loss) before reclassifications
 
—

 
181

 
(8
)
 
173

Amounts reclassified from accumulated other comprehensive income
 
—

 
(115
)
 
4

 
(111
)
Net 2017 other comprehensive income (loss)
 
—

 
66

 
(4
)
 
62

Balance, December 31, 2017
 
$
—

 
$
(310
)
 
$
(1
)
 
$
(311
)

(a) 
The Company's pension benefit plans were terminated in June 2015.
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) for 2017:
Details about Accumulated Other Comprehensive Income Components
 
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
 
 
Post Employment Benefit Items:
 
 
 
 
      Amortization of prior service cost
 
$
(339
)
 
(a) 
      Recognized net actuarial loss
 
184

 
(a) 
 
 
(155
)
 
 
 
 
40

 
Tax expense
 
 
$
(115
)
 
Net of tax
Equity Method Investment Adjustment:
 
 
 
 
     Accumulated postretirement benefit obligation
 
$
7

 
 
 
 
(3
)
 
Tax benefit
 
 
$
4

 
Net of tax
Reclassifications for 2017
 
$
(111
)
 
Total net of tax

(a) 
These accumulated other comprehensive income components are included in the computation of net period post-employment benefit cost (Note 9).