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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock-related compensation expense
The following table shows the total stock-related compensation expense relating to the stock options, RSUs and cash equivalent awards.
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2014
 
2013
 
2014
 
2013
Stock options
$
413

 
$
679

 
$
1,140

 
$
2,014

RSUs and performance-based equity awards
2,977

 
1,891

 
6,490

 
4,551

Cash-equivalent stock awards
12,868

 
8,212

 
17,497

 
20,968

Total
$
16,258

 
$
10,782

 
$
25,127

 
$
27,533
Rsus Other Than Performance Based Rsus [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of activity of stock awards
The activity related to the Company’s RSUs awards is as follows:
 
Six Months Ended June 30, 2014
 
Number of Awards
 
Weighted
Average
Grant Date
Fair Value
Outstanding at beginning of period
143,697

 
$
21.69

RSUs granted
454,176

 
33.56

RSUs forfeited
(5,097
)
 
(30.64
)
RSUs fully vested
(76,230
)
 
(21.75
)
Outstanding at end of period
516,546

 
$
32.03
Performance Based Rsus [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of activity of stock awards
The activity related to the Company’s performance-based equity awards is as follows:
 
Six Months Ended June 30, 2014
 
Number of Awards
 
Weighted
Average
Grant Date
Fair Value
Outstanding at beginning of period
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
(1,848
)
 
(25.28
)
Performance-based equity awards fully vested
(454,440
)
 
(20.50
)
Outstanding at end of period
619,428

 
$
27.51
Cash Equivalent Stock Awards [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of activity of cash equivalent awards
The activity related to the Company's cash-equivalent RSUs and performance-based awards is as follows:
 
RSU's
 
Performance-based Awards
Six Months Ended June 30, 2014
Number of Awards
 
Weighted Average Grant Date Fair Value
 
Number of Awards
 
Weighted Average Grant Date Fair Value
Outstanding at beginning of period
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
(38,886
)
 
(26.36
)
 
(2,769
)
 
(25.28
)
Fully vested
(751,920
)
 
(22.47
)
 
(454,440
)
 
(20.50
)
Outstanding at end of period
1,696,440

 
$
27.93

 
929,085

 
$
27.51