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STOCKHOLDERS' EQUITY (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock option activity
Our stock option activity and related information are summarized as follows:
Weighted-Average Contractual Terms 
Options Exercise Price (in Years) 
Outstanding at January 1, 2018176,959 $29.42 2.0
Exercised (11,533)29.29 
Forfeited or expired (50,652)27.61 
Outstanding at September 30, 2018114,774 $30.33 2.1
Schedule of restricted stock activity
Our restricted stock activity and related information are summarized as follows:
Weighted-Average 
Remaining 
Restricted Contractual Terms 
Stock (in Years) 
Outstanding at January 1, 2018548,005 0.3
Granted175,541 
Forfeited(1,335)
Vested(547,670)
Outstanding at September 30, 2018174,541 2.4
Restricted stock exercisable at September 30, 2018— 
Schedule of Warrants
Our warrant activity and related information are summarized as follows:
Weighted-Average 
Warrants Exercise Price 
Outstanding at January 1, 201844,101 $27.03 
Forfeited or expired (25,535)26.55 
Outstanding at September 30, 201818,566 $27.69