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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
Stockholders' Equity Note [Abstract]  
Summary of stock compensation amounts recognized in the consolidated statements of comprehensive income
 
Year Ended December 31,
 
2013
 
2012
 
2011
Compensation expense recorded for:
 
 
 
 
 
NSUs
$
10,545

 
$
11,849

 
$
11,719

SARs
1,302

 
1,501

 
1,813

RSUs
287

 
231

 
305

Directors' shares
1,002

 
1,080

 
966

Total compensation expense
13,136

 
14,661

 
14,803

Income tax benefit recognized
(4,950
)
 
(5,573
)
 
(5,788
)
Net compensation expense
$
8,186

 
$
9,088

 
$
9,015
Summary of the total remaining unrecognized compensation cost related to nonvested awards, that are considered probable of vesting and the weighted-average period over which the cost is expected to be recognized
 
Unrecognized
Compensation
Cost
 
Weighted-Average
Remaining
Vesting Period (Years)
NSUs
$
12,427

 
1.8
SARs
3,582

 
2.2
RSUs
4,859

 
2.2
Total
$
20,868

 
 
Summary of Nonvested Stock Units Issued Under the 2006 Plan
 
Number of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at January 1, 2011
798,000

 
$
35.61

Granted
199,000

 
87.50

Vested
(263,000
)
 
40.31

Forfeited
(57,000
)
 
46.61

Nonvested at December 31, 2011
677,000

 
$
48.14

Granted
209,000

 
63.18

Vested
(297,000
)
 
35.90

Forfeited
(18,000
)
 
63.68

Cancelled*
(200,000
)
 
62.17

Nonvested at December 31, 2012
371,000

 
$
58.51

Granted
304,000

 
57.30

Vested
(315,000
)
 
53.19

Forfeited
(20,000
)
 
61.08

Nonvested at December 31, 2013
340,000

 
$
62.23

_______________________________________________________________________________

*     Nonvested Stock Units cancelled during the period represent awards granted whose performance criteria were not met.
Summary of Stock Appreciation Rights Issued Under the 2006 Plan
 
Number of
SARs
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2011
1,125,000

 
$
26.73

 
8.7
 
$
59,636

Granted
—

 
—

 
 
 
 

Exercised
(365,000
)
 
26.73

 
 
 
 

Forfeited
—

 
—

 
 
 
 

Outstanding at December 31, 2011
760,000

 
$
26.73

 
8.8
 
$
37,118

Granted
—

 
—

 

 


Exercised
(15,000
)
 
26.73

 

 


Forfeited
—

 
—

 

 


Outstanding at December 31, 2012
745,000

 
$
26.73

 
7.9
 
$
10,087

Granted
—

 
—

 

 


Exercised
(15,000
)
 
26.73

 

 


Forfeited
—

 
—

 

 


Outstanding at December 31, 2013
730,000

 
$
26.73

 
6.9
 
$
42,143

Exercisable at December 31, 2013
205,000

 
$
26.73

 
3.4
 
$
11,835

Expected to vest and exercisable at December 31, 2013
694,817

 
$
26.73

 
6.9
 
$
40,112
Summary of Restricted Stock Units Issued Under the 2006 Plan
 
Number of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at January 1, 2011
85,000

 
$
26.73

Granted
275,000

 
82.09

Vested
(16,000
)
 
26.73

Forfeited
(25,000
)
 
82.09

Nonvested at December 31, 2011
319,000

 
$
70.15

Granted
352,000

 
56.12

Vested
—

 
—

Forfeited
—

 
—

Nonvested at December 31, 2012
671,000

 
$
62.80

Granted
156,000

 
84.52

Vested
—

 
—

Forfeited
(32,000
)
 
63.69

Nonvested at December 31, 2013
795,000

 
$
67.03