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Share-Based Compensation - Performance-based Nonvested Shares (Details) - Performance Shares - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares      
Outstanding at beginning of year 918 766 1,049
Number of shares granted 540 384 211
Vested (140) (241) (258)
Forfeited/canceled/adjusted (336) 9 (236)
Outstanding at end of year 982 918 766
Weighted Average Grant Date Fair Value      
Outstanding at beginning of year $ 31.19 $ 25.86 $ 22.75
Granted 45.91 36.84 30.89
Vested 37.91 22.92 17.57
Forfeited/canceled/adjusted 37.70 22.20 25.62
Outstanding at end of year $ 33.43 $ 31.19 $ 25.86