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Stockholders' Investment (Tables)
 9 Months Ended
Sep. 30, 2015
Equity [Abstract]  
Schedule of changes in stockholders' investment
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2015
 
2014
 
2015
 
2014
Beginning balance
$
594,812

 
$
530,764

 
$
558,775

 
$
500,365

Net income
5,791

 
14,413

 
35,866

 
39,595

Share-based compensation
423

 
614

 
2,044

 
1,750

Issuance costs from secondary stock offering
(225
)
 
—

 
(225
)
 
—

Issuance of common stock from share-based compensation
(68
)
 
—

 
3,082

 
2,715

Excess tax benefit on share-based compensation
(16
)
 
76

 
1,175

 
1,442

Ending balance
$
600,717

 
$
545,867

 
$
600,717

 
$
545,867