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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2017
Stockholders' Equity Note [Abstract]  
Restricted share activity
Restricted stock awards (RSAs), performance stock awards (PSAs) and performance stock units (PSUs) activity for the six months ended June 30, 2017 is summarized below:
 
Restricted Stock Awards
 
Performance Stock Awards
 
Performance Stock Units
 
Total
 
Weighted
Average
Grant Date
Fair Value
Unvested balance, December 31, 2016
577,244

 
345,656

 
—

 
922,900

 
$
58.15

Granted
377,076

 
—

 
231,100

 
608,176

 
56.98

Vested
(380,812
)
 
(260,894
)
 
(139,272
)
 
(780,978
)
 
57.63

Forfeited
(58,643
)
 
—

 
—

 
(58,643
)
 
54.48

Unvested balance, June 30, 2017
514,865

 
84,762

 
91,828

 
691,455

 
57.57