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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of the changes in our RSUs during the years ended December 31, 2017, 2016 and 2015 is as follows (shares in thousands):
Years Ended December 31,
2017
2016
2015
 
RSUs
Weighted-Average Grant-Date Fair Value per RSU
RSUs
Weighted-Average Grant-Date Fair Value per RSU
RSUs
Weighted-Average Grant-Date Fair Value per RSU
Outstanding, beginning balance
681

$
39.15

451

$
32.73

565

$
31.38

Granted
259

51.31

572

43.17

228

33.40

Vested
(372
)
43.89

(307
)
36.24

(300
)
31.50

Forfeited
(44
)
43.51

(35
)
40.97

(42
)
33.38

Outstanding, ending balance
524

$
41.51

681

$
39.15

451

$
32.73