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SHARE-BASED COMPENSATION - Share and cash settled awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Grant Date Fair Value    
Liability for cash-settled units $ 20,648 $ 21,535
Performance Based Restricted Stock and Restricted Stock Units | Share Settled    
Number of restricted stock units    
Nonvested restricted stock - beginning of year (in shares) 230,000 283,000
Granted (in shares) 104,000 87,000
Vested (in shares) (87,000) (119,000)
Forfeited (in shares) (15,000) (21,000)
Nonvested restricted stock - end of year (in shares) 232,000 230,000
Weighted Average Grant Date Fair Value    
Weighted average grant date fair value - beginning of year (in usd per share) $ 57.08 $ 51.27
Weighted average grant date fair value - granted (in usd per share) 48.89 64.58
Weighted average grant date fair value - vested (in usd per share) 54.71 49.14
Weighted average grant date fair value - forfeited (in usd per share) 53.80 55.00
Weighted average grant date fair value - end of year (in usd per share) $ 54.54 $ 57.08
Performance Based Restricted Stock and Restricted Stock Units | Cash Settled    
Number of restricted stock units    
Nonvested restricted stock - beginning of year (in shares) 42,000 68,000
Granted (in shares) 0 15,000
Vested (in shares) (12,000) (38,000)
Forfeited (in shares) (3,000) (3,000)
Nonvested restricted stock - end of year (in shares) 27,000 42,000
Service Based Restricted Stock And Restricted Stock Units | Share Settled    
Number of restricted stock units    
Nonvested restricted stock - beginning of year (in shares) 1,355,000 1,593,000
Granted (in shares) 737,000 733,000
Vested (in shares) (539,000) (889,000)
Forfeited (in shares) (142,000) (82,000)
Nonvested restricted stock - end of year (in shares) 1,411,000 1,355,000
Weighted Average Grant Date Fair Value    
Weighted average grant date fair value - beginning of year (in usd per share) $ 57.09 $ 48.88
Weighted average grant date fair value - granted (in usd per share) 49.36 61.94
Weighted average grant date fair value - vested (in usd per share) 54.51 47.48
Weighted average grant date fair value - forfeited (in usd per share) 55.36 54.89
Weighted average grant date fair value - end of year (in usd per share) $ 54.12 $ 57.09
Service Based Restricted Stock And Restricted Stock Units | Cash Settled    
Number of restricted stock units    
Nonvested restricted stock - beginning of year (in shares) 988,000 1,392,000
Granted (in shares) 473,000 432,000
Vested (in shares) (390,000) (763,000)
Forfeited (in shares) (139,000) (73,000)
Nonvested restricted stock - end of year (in shares) 932,000 988,000
Restricted Stock Units (RSUs)    
Weighted Average Grant Date Fair Value    
Vesting period 3 years  
Cliff Vesting | Performance Based Restricted Stock and Restricted Stock Units | Cash Settled    
Weighted Average Grant Date Fair Value    
Vesting period 3 years  
Cliff Vesting | Restricted Stock Units (RSUs) | Cash Settled    
Weighted Average Grant Date Fair Value    
Vesting period 3 years  
2014 Long Term Equity Compensation Plan | Cliff Vesting | Service Based Restricted Stock And Restricted Stock Units | Share Settled    
Number of restricted stock units    
Vested (in shares)   (313,391)
Weighted Average Grant Date Fair Value    
Vesting period   3 years
2014 Long Term Equity Compensation Plan | Cliff Vesting | Service Based Restricted Stock And Restricted Stock Units | Cash Settled    
Number of restricted stock units    
Vested (in shares)   (307,556)
Weighted Average Grant Date Fair Value    
Vesting period   3 years