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SHARE-BASED COMPENSATION - RSUs with Market Conditions (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]      
RSUs issued 1,122,585 796,000 685,000
RSUs issued, Amount $ 10,381 $ 9,045 $ 5,754
Reconciliation Of RSUs With Market Conditions [Abstract]      
RSUs beginning 1,590,417    
Number of RSUs granted 1,122,585 796,000 685,000
Number of RSUs forfeited (26,825) (58,000) (47,000)
Number of RSUs vested (611,383) (406,000) (410,000)
RSUs ending 2,074,794 1,590,417  
Net RSUs increase (decrease) to APIC $ 6,539 $ 5,524 $ 5,232
Fair value of each RSU issued with market conditions $ 9.24 $ 11.36 $ 8.4
Average fair value of performance condition RSUs issued $ 9.3 $ 11.85 $ 10.58
Restricted Stock Units With Market Conditions [Member]      
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]      
RSUs issued 470,000 165,000 290,000
Reconciliation Of RSUs With Market Conditions [Abstract]      
RSUs beginning 390,000 290,000 0
Number of RSUs granted 470,000 165,000 290,000
Number of RSUs forfeited 0 0 0
Number of RSUs vested (230,000) (65,000) 0
RSUs ending 630,000 390,000 290,000
RSUs forfeited $ 0 $ 0 $ 0
Fair value of each RSU issued with market conditions $ 7.34 $ 8.39 $ 6.9
Restricted Stock Units With Market Conditions [Member] | Maximum [Member]      
Reconciliation Of RSUs With Market Conditions [Abstract]      
RSUs beginning 29,000    
RSUs ending   29,000  
Restricted Stock Units With Service Conditions [Member]      
Reconciliation Of RSUs With Market Conditions [Abstract]      
Number of RSUs forfeited (27,000) (58,000) (47,000)
RSUs forfeited $ (280) $ (709) $ (727)
Restricted Stock Units With Performance Conditions [Member]      
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]      
RSUs issued 0 21,000 11,000
Reconciliation Of RSUs With Market Conditions [Abstract]      
RSUs beginning 29,000 8,000 0
Number of RSUs granted 0 21,000 11,000
Number of RSUs forfeited (29,000) 0 (3,000)
Number of RSUs vested 0 0 0
RSUs ending 0 29,000 8,000
Fair value of each RSU issued with market conditions $ 0 $ 11.11 $ 9.6