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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Assumptions used to estimate the fair value of the stock options and their results
The weighted average fair value of options granted was $0.84 per option, and the Company computed the fair value of options granted using the Black-Scholes option pricing model with the following assumptions:
Risk-free interest rate
 
1.37
%
Assumed dividend yield
 
3.60
%
Assumed lives of option awards (in years)
 
6.4

Assumed volatility
 
23.23
%
Stock options activity
The following is a summary of stock option activity for the years ended December 31, 2017, 2016, and 2015:
 
Number of
Options
(000s)
 
Weighted Average
Exercise Price Per Option
Outstanding at December 31, 2014
2,211

 
$
22.69

Exercised
(23
)
 
8.02

Forfeited/Expired
(425
)
 
21.98

Outstanding at December 31, 2015
1,763

 
22.05

Granted as a result of the Merger and Spin-Off
1,222

 
11.78

Exercised
(2
)
 
8.35

Forfeited/Expired
(721
)
 
27.24

Outstanding at December 31, 2016
2,262

 
10.82

Exercised
(577
)
 
7.51

Forfeited/Expired
(756
)
 
18.47

Outstanding at December 31, 2017
929

 
$
6.59

Options Exercisable at December 31, 2017
929

 
$
6.59
Summary of restricted stock activity
The following table summarizes restricted stock activity for the years ended December 31, 2017, 2016, and 2015:
 
Number of
Shares
(000s)
 
Weighted-Average Grant Date
Fair Value
Non-vested restricted stock at December 31, 2014
342

 
$
9.08

Granted
166

 
11.06

Vested
(210
)
 
8.41

Forfeited
(5
)
 
10.68

Non-vested restricted stock at December 31, 2015
293

 
10.65

Granted
235

 
8.62

Granted as a result of the Spin-Off
114

 
7.57

Vested
(141
)
 
8.54

Forfeited
(30
)
 
9.77

Non-vested restricted stock at December 31, 2016
471

 
7.57

Granted
308

 
8.63

Vested
(214
)
 
7.50

Forfeited
(8
)
 
6.53

Non-vested restricted stock at December 31, 2017
557

 
$
7.93
Summary of all performance-based RSU activity
The following table summarizes the performance-based RSU activity as of December 31, 2017, 2016, and 2015 (in thousands):
Outstanding at December 31, 2014
796

Granted
244

Vested
(191
)
Forfeited
(6
)
Outstanding at December 31, 2015
843

Granted
312

Granted as a result of the Spin-Off
308

Vested
(160
)
Forfeited
(30
)
Outstanding at December 31, 2016
1,273

Granted
399

Vested
(576
)
Forfeited
(12
)
Outstanding at December 31, 2017
1,084