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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of share-based compensation expense
Share-based compensation expense was as follows:
For the years ended December 31,
2017
 
2016
 
2015
Continuing operations
 
 
 
 
 
Stock options, net of estimated forfeitures
$
48,601

 
$
25,008

 
$
20,637

Restricted stock awards
13,243

 
10,106

 
10,305

Total non-cash stock compensation
61,844

 
35,114

 
30,942

Deferred compensation arrangement
—

 
738

 
4,901

Total continuing operations
$
61,844

 
$
35,852

 
$
35,843

 
 
 
 
 
 
Discontinued operations
 
 
 
 
 
Share-based compensation expense for discontinued operations
2,944

 
2,957

 
3,178

Total continuing and discontinued operations
$
64,788

 
$
38,809

 
$
39,021
Summary of stock options activity
The following tables summarize the stock option activity and the assumptions used to record the related share-based compensation expense for the years ended December 31, 2017, 2016 and 2015:
 
 
2017
 
2016
 
2015
 
 
Options
Weighted Average Exercise Price
Aggregate Intrinsic Value
 
Options
Weighted Average Exercise Price
Aggregate Intrinsic Value
 
Options
Weighted Average Exercise Price
Aggregate Intrinsic Value
Outstanding at January 1
 
10,928

$
21.81

$
4,350

 
11,427

$
26.12

$
20,339

 
10,919

$
25.84

$
48,851

Granted
 
4,283

$
19.01

 
 
303

$
23.29

 
 
1,447

$
26.72

 
Exercised
 
—

$
—

$
—

 
(245
)
$
19.57

$
899

 
(460
)
$
18.76

$
3,365

Forfeited or expired
 
(5,308
)
$
18.34

 
 
(557
)
$
23.78

 
 
(479
)
$
28.52

 
Outstanding at December 31
 
9,903

$
19.30

$
—

 
10,928

$
21.81

$
4,350

 
11,427

$
26.12

$
20,339

Exercisable at December 31
 
8,606

$
19.38

$
—

 
9,004

$
21.48

$
4,350

 
8,293

$
24.32

$
20,328

Vested and expected to vest
 
9,847

$
19.31

$
—

 
10,790

$
21.79

$
4,350

 
11,110

$
26.08

$
20,339
Summary of stock option plans, by exercise price range
 
Options Outstanding
 
Options Exercisable
 
Assumption Range*
Exercise Prices
Number
of Shares
Weighted
Average
Remaining
Contractual
Terms (Years)
 
Number
of Shares
Weighted
Average
Remaining
Contractual
Terms (Years)
 
Risk-Free
Interest Rate
Expected
Terms
in Years
Expected
Volatility
Year Ended December 31, 2017
 
 
 
 
 
 
 
 
 
$14.58 - $19.56
6,500

4.58
 
5,549

4.22
 
 0.33% - 3.31%
2.03 -10.00
 32.18% - 69.74%
$21.00 - $21.28
693

2.18
 
347

0.66
 
 0.43% - 3.60%
 2.11 - 6.67
 33.24% - 57.79%
$21.32 - $21.52
1,776

2.14
 
1,776

2.14
 
 0.68% - 2.61%
 3.38 - 6.55
 38.16% - 69.74%
$21.68 - $22.32
221

1.94
 
221

1.94
 
 0.57% - 3.03%
 2.18 - 6.52
 36.78% - 52.47%
$22.88 - $31.92
713

3.76
 
713

3.76
 
 0.73% - 2.86%
 4.00 - 6.52
 39.03% - 53.80%
Year Ended December 31, 2016
 
 
 
 
 
 
 
 
 
$18.36 - $19.56
3,601

0.80
 
3,601

0.80
 
 0.32% - 4.20%
 1.90 - 6.95
 26.85% - 52.47%
$20.16 - $21.28
353

1.66
 
353

1.66
 
 0.42% - 3.60%
 2.11 - 6.52
 33.24% - 52.47%
$21.48 - $21.52
438

3.81
 
438

3.81
 
 0.68% - 2.63%
 3.38 - 6.58
 38.16% - 52.47%
$21.68 - $22.32
320

3.10
 
320

3.10
 
 0.57% - 3.03%
 2.18 - 6.52
 36.78% - 52.47%
$22.40 - $31.92
6,216

7.07
 
4,291

6.71
 
 0.73% - 2.86%
 4.00 - 7.12
 39.03% - 58.84%
Year Ended December 31, 2015
 
 
 
 
 
 
 
 
 
$18.36 - $19.56
3,790

1.80
 
3,790

1.80
 
 0.32% - 4.20%
 1.90 - 6.95
 26.85% - 52.47%
$20.16 - $21.28
353

2.70
 
353

2.70
 
 0.42% - 3.60%
 2.11 - 6.52
 33.24% - 52.47%
$21.48 - $21.52
516

4.80
 
512

4.80
 
 0.68% - 2.63%
 3.38 - 6.58
 38.16% - 52.47%
$21.68 - $22.32
344

4.10
 
344

4.10
 
 0.57% - 3.03%
 2.18 - 6.52
 36.78% - 52.47%
$22.88 - $31.92
2,634

8.20
 
1,108

7.14
 
 0.73% - 2.86%
 4.00 - 6.52
 39.03% - 58.84%
$34.52
3,788

7.80
 
2,184

7.80
 
 1.76% - 2.07%
 6.02 - 7.12
 51.51% - 53.51%
* The expected dividend yield is zero for all options in all years.
Summary of non-vested restricted stock and restricted stock units activity
The following table summarizes the non-vested restricted stock and restricted stock units activity for the years ended December 31, 2017, 2016 and 2015:
 
 
2017
 
2016
 
2015
 
 
Shares
 
Weighted Average Grant Date Fair Value
 
Shares
 
Weighted Average Grant Date Fair Value
 
Shares
 
Weighted Average Grant Date Fair Value
Non-vested at January 1
 
1,038

 
$
25.97

 
865

 
$
29.6

 
694

 
$
32.48

Granted
 
1,337

 
$
16.65

 
655

 
$
23.27

 
449

 
$
26.28

Vested
 
(328
)
 
$
22.35

 
(386
)
 
$
29.36

 
(215
)
 
$
31.48

Forfeited
 
(397
)
 
$
23.33

 
(96
)
 
$
26.51

 
(63
)
 
$
31.08

Non-vested at December 31
 
1,650

 
$
19.74

 
1,038

 
$
25.97

 
865

 
$
29.6