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Restricted Stock - Narrative (Details) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2013
Selling, General and Administrative Expenses          
Stock Options Warrants and Restricted Stock (Textual)          
Equity-based compensation expense   $ 3,602 $ 3,830 $ 3,893  
Net tax benefit recognized on equity-based compensation expense   1,378 1,465 1,489  
Amount of tax benefit realized from restricted stock   962 2,119 1,014  
Restricted stock          
Stock Options Warrants and Restricted Stock (Textual)          
Total unrecognized compensation cost related to nonvested restricted stock awards granted   $ 5,072      
Weighted average period for recognition   1 year 2 months 12 days      
Reduction to additional paid-in capital   $ 268 $ 630 $ 724  
2007 Plan          
Stock Options Warrants and Restricted Stock (Textual)          
Number of shares available for grant (in shares)         6,239
2013 Plan          
Stock Options Warrants and Restricted Stock (Textual)          
Number of shares available for grant (in shares)   2,498      
Issuance of common stock to directors, employees, consultants and advisors (in shares) 5,000        
Term of the plan 10 years