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Stock Based Compensation and Other Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2016
Restricted Stock Units (RSUs) [Member]  
Notes Tables  
Weighted-average exercise price and grant date fair value of stock options
We estimated the fair value of each performance-based restricted stock unit at the date of grant using the Monte Carlo valuation model, with the following weighted average assumptions:
 
Year Ended December 31,
 
2016
 
2015
 
2014
Risk-free interest rate
0.95
%
 
1.02
%
 
0.81
%
Average closing price(1)
$
4.69

 
$
8.96

 
$
11.28

Expected volatility
46.9
%
 
38.4
%
 
44.5
%
Dividend yield
%
 
%
 
%

(1)
Average closing price of our shares over the 30-calendar days ending May 16, 2016, May 19, 2015 and May 16, 2014, respectively
Employee Stock Option [Member]  
Notes Tables  
Schedule of activity for stock options outstanding
The following table summarizes activity for our outstanding stock options for the year ended December 31, 2016:
 
Shares
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic Value
Outstanding at beginning of period
3,887,833

 
$
7.96

 
 
 
 

Granted
1,242,856

 
4.32

 
 
 
 

Exercised
(125,017
)
 
5.80

 
 
 
 

Expired or canceled
(320,833
)
 
8.43

 
 
 
 

Outstanding at end of period
4,684,839

 
$
7.02

 
6.14
 
$
7,130,887

 
 
 
 
 
 
 
 
Vested or expected to vest at end of period
4,592,882

 
$
7.06

 
6.08
 
$
6,878,173

Options exercisable at end of period
2,910,115

 
$
7.67

 
4.40
 
$
3,235,311

Schedule of weighted average assumptions for fair value of options granted
We estimated the fair value of options granted on the date of grant using the Black-Scholes option-pricing model, with the following weighted average assumptions:
 
Year Ended December 31,
 
2016
 
2015
 
2014
Risk-free interest rate
1.38
%
 
1.57
%
 
1.53
%
Expected life of the option in years
5.22

 
5.22

 
5.22

Expected volatility
50.5
%
 
47.3
%
 
48.6
%
Dividend yield
%
 
%
 
%
Weighted-average exercise price and grant date fair value of stock options
The following table summarizes information about the weighted-average exercise price and the weighted-average grant date fair value of stock options granted:
 
Year Ended December 31,
 
2016
 
2015
 
2014
Weighted-average exercise price of the stock on the date of grant
$
4.32

 
$
9.00

 
$
11.20

Weighted-average grant date fair value on the date of grant
$
1.97

 
$
3.91

 
$
4.97

Schedule of activity for outstanding cash-settled stock appreciation rights
The following table summarizes activity for outstanding cash-settled stock appreciation rights for the year-ended December 31, 2016:
 
Rights
Outstanding at beginning of period
103,133

Exercised

Expired or cancelled
(33,633
)
Outstanding at end of period
69,500

 
 
Exercisable at end of period
69,500

Schedule of performance-based restricted stock units
The ending TSR price is equal to the average closing price of our shares over the last 30-calendar days of the performance period as set forth in the following table:
 
Year Ended December 31,
 
2016
 
2015
 
2014
Number of performance-based restricted stock units issued, at target
230,790

 
136,881

 
110,497

Range of payout of shares for each executive
0% - 150%

 
0% - 150%

 
0% - 150%

Performance period begin date
June 1, 2016

 
June 1, 2015

 
June 1, 2014

Performance period end date
May 31, 2019

 
May 31, 2018

 
May 31, 2017

Estimated fair value at date of grant
$
5.18

 
$
10.06

 
$
12.55


Schedule of activity for outstanding performance-based restricted stock units
The following table summarizes activity for outstanding performance-based restricted stock units for the year-ended December 31, 2016:
Nonvested Performance-Based Restricted Stock Units
Shares
 
Weighted-Average
Grant Date
Fair Value
Outstanding at beginning of period
335,329

 
$
11.69

Granted
230,790

 
5.18

Vested
(58,072
)
 
13.11

Forfeited
(60,863
)
 
12.51

Outstanding at the end of period
447,184

 
$
8.06

Schedule of activity for outstanding time-vested restricted stock awards and restricted stock units
The following tables summarize the activity for our outstanding time-vested restricted stock awards and restricted stock units 2016.
Nonvested Restricted Stock Awards (Time-Vesting)
Shares
 
Weighted-Average
Grant Date
Fair Value
Nonvested at January 1, 2016
881,345

 
$
11.00

Granted
262,961

 
4.50

Vested
(449,342
)
 
10.50

Forfeited
(99,429
)
 
11.30

Nonvested at December 31, 2016
595,535

 
$
8.45

Nonvested Restricted Stock Units (Time-Vesting)
Shares
 
Weighted-Average
Grant Date
Fair Value
Nonvested at January 1, 2016
1,133,543

 
$
9.11

Granted
1,534,994

 
4.36

Vested
(332,043
)
 
9.30

Forfeited
(153,465
)
 
8.04

Nonvested at December 31, 2016
2,183,029

 
$
5.82