XML 82 R68.htm IDEA: XBRL DOCUMENT v3.3.1.900
Stock-Based Compensation (Nonvested Performance-based Award Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Incentive Stock Awards [Member]      
Non-vested PVS Awards [Roll Forward]      
Granted at target level 1,500 4,200 5,300
Forfeited (200) (4,100) (200)
Non-vested PVS Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Granted at target level $ 51.53 $ 48.69 $ 29.56
Performance-Vesting Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares to be issued upon conversion 412,687    
Average remaining term of shares issued at conversion 1 year    
Non-vested PVS Awards [Roll Forward]      
Outstanding, Beginning 470,719 578,358 652,662
Granted at target level 147,908 133,823 175,498
Adjustments above/(below) target 132,444 53,438 38,330
Vested and converted (318,337) (250,205) (273,044)
Forfeited (10,008) (44,695) (15,088)
Outstanding, Ending 422,726 470,719 578,358
Non-vested PVS Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding, Beginning (in usd per share) $ 30.93 $ 23.79 $ 21.42
Granted at target level 55.49 47.21 29.67
Adjustments above/(below) target 22.97 22.86 23.83
Vested and converted 51.53 48.69 29.56
Forfeited 41.84 30.76 23.29
Outstanding, Ending (in usd per share) $ 45.60 $ 30.93 $ 23.79
Performance-Vesting Units [Member]      
Non-vested PVS Awards [Roll Forward]      
Outstanding, Beginning 55,509 79,456 69,240
Granted at target level 1,386 1,584 25,538
Adjustments above/(below) target 19,315 6,907 3,000
Vested and converted (47,014) (32,438) (18,322)
Outstanding, Ending 29,196 55,509 79,456
Non-vested PVS Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding, Beginning (in usd per share) $ 26.15 $ 23.86 $ 20.98
Granted at target level 54.14 47.34 29.56
Adjustments above/(below) target 22.07 22.72 25.30
Vested and converted 51.53 47.34 29.56
Outstanding, Ending (in usd per share) $ 32.07 $ 26.15 $ 23.86
Minimum [Member] | Performance-Vesting Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Actual payout range 0.00%    
Minimum [Member] | Performance-Vesting Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Actual payout range 0.00%    
Maximum [Member] | Performance-Vesting Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Actual payout range 200.00%    
Maximum [Member] | Performance-Vesting Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Actual payout range 200.00%