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Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation Expense
Stock-based compensation expense consisted of the following (in thousands):
 
 
Years Ended December 31,
 
 
2017
 
2016
 
2015
Restricted stock and stock units - expense
 
$
42,191

 
$
42,699

 
$
41,292
Total Unrecognized Compensation Cost, Net of Estimated Forfeitures
Total unrecognized compensation cost, net of estimated forfeitures, consisted of the following (in thousands):
 
 
December 31,
 
 
2017
 
2016
 
2015
Restricted stock and stock units - unrecognized future costs
 
$
62,730

 
$
60,481

 
$
60,627
Activity Under All Stock Plans and Weighted Average Exercise Prices
The following table reflects activity under all stock plans from December 31, 2014 through December 31, 2017, and the weighted average exercise prices (in thousands, except per share amounts):
 
 
 
Restricted Stock Plans
without Market-Condition
 
Restricted Stock Plans
with Market-Condition
 
Stock Option Plans
 
 
Number of
Shares/
Units
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Shares/
Units
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Shares/
Units
 
Weighted
Average Exercise
Price Per Share
Outstanding, December 31, 2014
 
 
1,165

 
 
$36.47
 
 
1,234

 
 
$40.24
 
 
77

 
 
$29.22
Granted
 
 
502

 
 
$58.14
 
 
257

 
 
$71.86
 
 
—

 
 
—
Exercised
 
 
—

 
 
—
 
 
—

 
 
—
 
 
(54
)
 
 
$28.18
Restrictions lapsed
 
 
(599
)
 
 
$36.30
 
 
(499
)
 
 
$31.41
 
 
—

 
 
—
Forfeited
 
 
(16
)
 
 
$37.63
 
 
—

 
 
—
 
 
(11
)
 
 
$30.94
Outstanding, December 31, 2015
 
 
1,052

 
 
$46.88
 
 
992

 
 
$52.89
 
 
12

 
 
$32.36
Granted
 
 
772

 
 
$38.47
 
 
358

 
 
$45.93
 
 
—

 
 
—
Exercised
 
 
—

 
 
—
 
 
—

 
 
—
 
 
(7
)
 
 
$32.36
Restrictions lapsed
 
 
(545
)
 
 
$42.42
 
 
(364
)
 
 
$43.04
 
 
—

 
 
—
Forfeited
 
 
(36
)
 
 
$41.28
 
 
(36
)
 
 
$43.04
 
 
(5
)
 
 
$32.36
Outstanding, December 31, 2016
 
 
1,243

 
 
$43.78
 
 
950

 
 
$54.42
 
 
—

 
 
—
Granted
 
 
904

 
 
$47.86
 
 
50

 
 
$50.09
 
 
—

 
 
—
Exercised
 
 
—

 
 
—
 
 
—

 
 
—
 
 
—

 
 
—
Restrictions lapsed
 
 
(616
)
 
 
$44.09
 
 
(384
)
 
 
$50.09
 
 
—

 
 
—
Forfeited
 
 
(41
)
 
 
$43.68
 
 
—

 
 
—
 
 
—

 
 
—
Outstanding, December 31, 2017
 
 
1,490

 
 
$46.13
 
 
616

 
 
$56.76
 
 
—

 
 
—
Pre-Tax Intrinsic Value of Stock Option Exercised
The total pre-tax intrinsic value of stock options exercised and the total fair value of shares vested during the years ended December 31, 2017, 2016 and 2015, are reflected in the following table (in thousands):
 
 
 
Years Ended December 31,
 
 
2017
 
2016
 
2015
Total pre-tax intrinsic value of stock options exercised
 
$
—

 
$
52

 
$
1,709

Total fair value of shares vested
 
$
50,385

 
$
39,302

 
$
56,570