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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Total Stock-Based Compensation Expense Recognized

Total compensation expense recognized is as follows:

 

 

 

2016

 

 

2015

 

 

2014

 

 

 

(In thousands)

 

Restricted stock awards (“RSAs”) and restricted stock units (“RSUs”)

 

$

15,746

 

 

$

14,395

 

 

$

14,417

 

Performance shares and performance units

 

 

6,888

 

 

 

1,428

 

 

 

352

 

Stock options

 

 

46

 

 

 

770

 

 

 

1,747

 

Total

 

$

22,680

 

 

$

16,593

 

 

$

16,516

 

 
Total Gross Unrecognized Estimated Compensation Expense and Expected Weighted-Average Periods

The components of the total gross unrecognized estimated compensation expense for equity awards and their expected remaining weighted-average periods for expense recognition are as follows:

 

 

 

Amount

(In thousands)

 

 

Weighted-Average Period (years)

 

RSUs and RSAs

 

$

17,603

 

 

 

1.8

 

Performance shares and performance units(1)

 

 

258

 

 

 

0.3

 

 

 

$

17,861

 

 

 

 

 

 

(1)

Excludes performance shares and performance units accounted for as liability awards.

Activity for Stock Option

The following table summarizes stock options activity during 2016 (share data in thousands):

 

 

 

Number of Option Shares

 

 

Weighted-Average Exercise Price

 

 

Weighted-Average Remaining Contractual Term

 

Outstanding at beginning of period

 

 

2,896

 

 

$

12.76

 

 

 

 

 

Cancelled/expired/forfeited

 

 

(721

)

 

 

8.65

 

 

 

 

 

Outstanding at end of period(1)

 

 

2,175

 

 

$

14.13

 

 

 

1.94 years

 

(1)

All remaining outstanding options were vested prior to December 31, 2016.

Nonvested RSUs and RSAs and Changes

RSUs and RSAs and changes during 2016 were as follows (share data in thousands):

 

 

 

Number of Shares

 

 

Weighted-Average Grant Date Fair Value

 

Nonvested at beginning of period

 

 

6,689

 

 

$

5.15

 

Granted

 

 

3,876

 

 

 

3.28

 

Vested

 

 

(3,524

)

 

 

5.78

 

Cancelled/forfeited

 

 

(868

)

 

 

3.86

 

Nonvested at end of period

 

 

6,173

 

 

$

3.80

 

 
Nonvested Performance Shares and Performance Unit Awards and Changes

Nonvested performance share awards and changes during 2016 were as follows (share data in thousands):

 

 

 

Number of Shares

 

 

Weighted-Average Grant Date Fair Value

 

Nonvested at beginning of period

 

 

2,590

 

 

$

6.71

 

Granted

 

 

1,582

 

 

 

3.22

 

Cancelled/forfeited

 

 

(711

)

 

 

10.22

 

Nonvested at end of period

 

 

3,461

 

 

$

4.39