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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013, 2012 and 2011 is as follows (shares in thousands):
Years Ended December 31,
2013
2012
2011
 
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
665

$
27.74

346

$
25.64

144

$
23.54

Granted
506

31.12

533

28.99

271

26.94

Vested
(337
)
28.52

(175
)
26.87

(64
)
26.44

Forfeited
(65
)
29.97

(39
)
27.95

(5
)
25.94

Outstanding, ending balance
769

$
29.49

665

$
27.74

346

$
25.64