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Stock-Based Compensation - Restricted Stock Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Shares Granted      
Non-vested at beginning of period 266 285 270
Shares granted (in shares) 138 155 196
Shares Vested (178) (171) (178)
Shares Forfeited (1) (3) (3)
Non-vested at end of period 225 266 285
Weighted-Average Grant Date Fair Value      
Weighted-Average Grant Date Fair Value Non-vested at beginning of period $ 39.28 $ 24.64 $ 18.72
Weighted-Average Grant Date Fair Value Granted 53.64 51.29 28.86
Weighted-Average Grant Date Fair Value Vested 35.09 25.78 20.44
Weighted-Average Grant Date Fair Value Forfeited 63.19 37.78 15.49
Weighted-Average Grant Date Fair Value Non-vested at end of period $ 51.31 $ 39.28 $ 24.64