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Stock-Based Compensation - Restricted Stock Activity (Details)
shares in Thousands
 9 Months Ended
Sep. 30, 2016
$ / shares
shares
Shares (in 000's)  
Non-vested at beginning of period (in shares) | shares 225
Granted (in shares) | shares 76
Vested (in shares) | shares (57)
Forfeited (in shares) | shares (2)
Non-vested at end of period (in shares) | shares 242
Weighted-Average Grant Date Fair Value  
Non-vested at beginning of period (in dollars per share) | $ / shares $ 51.31
Granted (in dollars per share) | $ / shares 63.23
Vested (in dollars per share) | $ / shares 50.18
Forfeited (in dollars per share) | $ / shares 55.80
Non-vested at end of period (in dollars per share) | $ / shares $ 55.32