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Share-Based Compensation - Nonvested Shares (Details) - Unvested Restricted Awards - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares      
Outstanding at beginning of year 1,146,000 1,769,000 1,783,000
Granted 362,804 388,211 672,724
Vested (562,000) (930,000) (602,000)
Forfeited/canceled (84,000) (81,000) (85,000)
Outstanding at end of year 863,000 1,146,000 1,769,000
Weighted Average Grant-Date Fair Value      
Outstanding at beginning of year $ 31.11 $ 26.75 $ 24.19
Granted 46.23 38.38 30.67
Vested 29.95 26.05 23.74
Forfeited/canceled/adjusted 36.79 28.78 25.47
Outstanding at end of year $ 37.78 $ 31.11 $ 26.75