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Common Stock and Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Unit Activity
The following table summarizes RSU activity during the three months ended March 31, 2017:
 
Employees
 
Non-Employee Directors
 
Total
RSUs outstanding at January 1, 2017
872,785

 
80,207

 
952,992

RSUs granted
374,918

 
45,528

 
420,446

Shares issued upon vesting of RSUs
(213,451
)
 
(37,204
)
 
(250,655
)
RSUs canceled or forfeited(1)
(125,218
)
 
(2,112
)
 
(127,330
)
RSUs outstanding at March 31, 2017
909,034

 
86,419

 
995,453

Weighted average grant date fair value
$
18.00

 
$
18.46

 
$
18.04


(1)
Pursuant to the terms of our plans, employees have the option of forfeiting RSUs to cover their minimum statutory tax withholding when shares are issued. Any RSUs surrendered or canceled in satisfaction of participants’ tax withholding obligations are not available for future grants under the plans.
The following table summarizes PSU activity during the three months ended March 31, 2017:
 
PSUs
 
Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017
90,583

 
$
19.13

Granted
158,402

 
18.84

Vested
—

 
—

Forfeited
—

 
—

Outstanding at March 31, 2017
248,985

 
$
18.94
Summary of Phantom Share Activity
The following table summarizes the phantom share activity during the three months ended March 31, 2017:
 
Shares
 
Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017
1,361,062

 
$
17.78

Granted
750,893

 
18.45

Converted/paid
(570,113
)
 
16.97

Forfeited
(51,959
)
 
18.08

Outstanding at March 31, 2017
1,489,883

 
$
18.42
Summary of Stock Option Activity
The following table summarizes stock option activity during the three months ended March 31, 2017:
 
Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
Options outstanding and exercisable at January 1, 2017
2,038,829

 
$
19.78

 
 
 
 
Forfeited and canceled
(487,971
)
 
26.07

 
 
 
 
Exercised
(31,567
)
 
17.26

 
 
 
 
Options outstanding and exercisable at March 31, 2017
1,519,291

 
$
17.81

 
1.99
 
$
4,957,607
Summary of Share-Based Compensation Expense Recognized
The following table summarizes the share-based compensation expense recognized during the three months ended March 31, 2017 and 2016:
 
Three Months Ended March 31
 
2017
 
2016
 
(In thousands)
RSUs
$
1,608

 
$
1,369

PSUs
500

 
387

Phantom shares
1,849

 
4,311

Total
$
3,957


$
6,067