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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Summary of Quarterly Results
Summarized quarterly results for the years ended December 31, 2017 and 2016 are as follows:

Three months ended 2017
 
Year ended
 
March 31
 
June 30
 
September 30
 
December 31
 
December 31, 2017

 
 
 
 
 
 
 
 
 
Revenues, net
$
183,033

 
$
189,057

 
$
192,345

 
$
197,875

 
$
762,310

Gross profit**
$
63,851

 
$
65,211

 
$
69,156

 
$
68,506

 
$
266,724

Net income/(loss)
$
16,788

 
$
20,378

 
$
21,077

 
$
(9,355
)
 
$
48,888

Earnings/(loss) per share:

 

 

 

 

Basic*
$
0.50

 
$
0.60

 
$
0.62

 
$
(0.27
)
 
$
1.44

Diluted*
$
0.48

 
$
0.58

 
$
0.60

 
$
(0.27
)
 
$
1.39

Weighted-average number of shares used in computing earnings per share:

 

 

 

 

Basic*
33,845,560

 
33,819,320

 
33,838,374

 
34,086,711

 
33,897,916

Diluted*
35,108,882

 
34,993,226

 
35,043,987

 
34,086,711

 
35,110,210



 

 

 

 

Stock compensation expense
$
5,956

 
$
5,107

 
$
5,708

 
$
6,270

 
$
23,041

Amortization of intangibles
$
3,498

 
$
3,507

 
$
3,487

 
$
3,483

 
$
13,975


Three months ended 2016
 
Year ended
 
March 31
 
June 30
 
September 30
 
December 31
 
December 31, 2016
 
 
 
 
 
 
 
 
 


Revenues, net
$
167,036

 
$
170,478

 
$
171,200

 
$
177,274

 
$
685,988

Gross profit**
$
58,657

 
$
58,452

 
$
59,433

 
$
61,490

 
$
238,032

Net income
$
13,820

 
$
16,375

 
$
16,050

 
$
15,488

 
$
61,733

Earnings per share:

 

 

 

 

Basic*
$
0.41

 
$
0.49

 
$
0.48

 
$
0.46

 
$
1.84

Diluted*
$
0.40

 
$
0.47

 
$
0.46

 
$
0.45

 
$
1.79

Weighted-average number of shares used in computing earnings per share:

 

 

 

 

Basic*
33,380,028

 
33,621,444

 
33,624,401

 
33,638,170

 
33,566,367

Diluted*
34,351,657

 
34,510,400

 
34,675,485

 
34,714,308

 
34,563,319



 

 

 

 

Stock compensation expense
$
5,809

 
$
4,450

 
$
4,484

 
$
5,027

 
$
19,770

Amortization of intangibles
$
2,715

 
$
2,718

 
$
2,848

 
$
3,592

 
$
11,873


* Total of quarterly basic and diluted earnings per share and weighted average number of shares used in computing earnings per share will not be equal to year end basic and diluted earnings per share and weighted average number of shares used in computing earnings per share, respectively. For the quarter ended December 31, 2017, 1,206,335 weighted average common shares were considered anti-dilutive and not included in computing diluted earnings per share.

**During the quarter ended December 31, 2017, the Company early adopted ASU 2017-12, Derivative and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities. Pursuant to this adoption effective January 1, 2017, the Company recorded settlement gain/(loss) on cash flow hedges in cost of revenues and operating expenses, as applicable, in the consolidated statements of income for each of the quarters of 2017. See Note 15 for further details.