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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of activity related to options
The following table summarizes the activity related to options granted and exercised:
 
Year Ended December 31,
 
2014

2013

2012
Options granted
—

 
—

 
—

Weighted average grant date fair value
$
—

 
$
—

 
$
—

Options exercised
(479,831
)
 
(674,187
)
 
(801,810
)
Total intrinsic value of options exercised
$
10,313

 
$
12,212

 
$
9,650

Proceeds from option exercises
$
10,027

 
$
12,137

 
$
10,527



The activity related to the Company’s stock options is as follows:
 
Year Ended December 31, 2014
 
Options

Weighted
Average
Exercise Price

Weighted
Average
Contractual
Term

Aggregate
Intrinsic
Value
Outstanding at beginning of year
2,928,312

 
$
16.07

 

 

Granted
—

 
$
—

 

 

Exercised
(479,831
)
 
$
(14.25
)
 

 

Forfeited
(15,096
)
 
$
(20.50
)
 

 

Expired
(6,711
)
 
$
(16.35
)
 

 

Outstanding at end of year
2,426,674

 
$
16.40

 
4.7 years
 
$
52,212

Exercisable at end of year
2,151,790

 
$
15.88

 
4.5 years
 
$
47,424
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of compensation expense by type of award
The following table shows the total stock-related compensation expense relating to the stock options, RSUs, LTIP and cash equivalent awards.
 
Year Ended December 31,
 
2014

2013

2012
Stock options
$
1,949

 
$
3,269

 
$
4,256

RSUs and performance-based equity awards
12,295

 
10,700

 
13,010

LTIP
—

 
—

 
376

Cash-equivalent stock awards
37,790

 
50,878

 
32,760

Total
$
52,034


$
64,847


$
50,402
Rsus Other Than Performance Based Rsus  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of activity related to equity based awards granted and exercised
The activity related to the Company’s RSUs awards is as follows:

Year Ended December 31, 2014
 
Number of Awards

Weighted
Average
Grant Date
Fair Value

Aggregate
Intrinsic
Value
Outstanding at beginning of year
143,697

 
$
21.69

 

RSUs granted
454,176

 
33.56

 

RSUs forfeited
(16,386
)
 
(31.22
)
 

RSUs fully vested
(78,981
)
 
(21.76
)
 

Outstanding at end of year
502,506

 
$
32.10

 
$
19,055
Performance Based Rsus  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of activity related to equity based awards granted and exercised
The activity related to the Company’s performance-based equity awards is as follows:
 
Year Ended December 31, 2014
 
Number of Awards
 
Weighted
Average
Grant Date
Fair Value
 
Aggregate
Intrinsic
Value
Outstanding at beginning of year
804,519

 
$
23.21

 
 
Performance-based equity awards granted
166,302

 
33.56

 
 
Additional awards granted due to achievement of performance criteria
104,895

 
20.50

 
 
Performance-based equity awards forfeited
(4,635
)
 
(25.20
)
 
 
Performance-based equity awards fully vested
(454,440
)
 
(20.50
)
 
 
Outstanding at end of year
616,641

 
$
27.52

 
$
23,383
Cash-equivalent stock awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of activity related to cash-equivalent equity awards
The activity related to the Company's cash-equivalent RSUs and performance-based equity awards is as follows:
 
RSU's
 
Performance-based Awards
Year Ended December 31, 2014
Number of Awards
 
Weighted Average Grant Date Fair Value
 
Number of Awards
 
Weighted Average Grant Date Fair Value
Outstanding at beginning of year
2,049,084

 
$
24.69

 
1,031,961

 
23.67

Granted
438,162

 
33.56

 
249,438

 
33.56

Additional awards granted due to achievement of performance criteria
—

 
—

 
104,895

 
20.50

Forfeited
(77,322
)
 
(27.12
)
 
(6,948
)
 
(25.20
)
Fully vested
(755,860
)
 
(22.51
)
 
(454,440
)
 
(20.50
)
Outstanding at end of year
1,654,064

 
$
27.99

 
924,906

 
$
27.52