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BENEFIT PLANS: (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
BENEFIT PLANS:    
Number of expatriate noncontributory defined benefit pension plans 2  
Post retirement defined benefit plans
    
Defined benefit plan, net periodic benefit cost    
Service cost $ 0.6 $ 0.7
Interest cost 0.7 0.5
Expected return on plan assets (1.8) (1.8)
Amortization of net actuarial loss (0.2) (0.4)
Amortization of net loss (gain)   0.1
Net periodic benefit costs (0.7) (0.9)
Post retirement defined benefit plans | Maximum
    
Defined benefit plan, net periodic benefit cost    
Amortization of net loss (gain) (0.1)  
Post-retirement Health Care Plan
    
Defined benefit plan, net periodic benefit cost    
Interest cost 0.7 0.8
Amortization of net loss (gain) (0.2)  
Net periodic benefit costs 0.5 0.8
Post-retirement Health Care Plan | Maximum
    
Defined benefit plan, net periodic benefit cost    
Amortization of net loss (gain)   (0.1)
Amortization of prior service cost (credit) $ (0.1) $ (0.1)