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Long-term Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Unit Award Activity in Payment Awards
As of December 31, 2016, a total of 373,434 shares of common stock had been issued and 2,828,003 RSUs and options were outstanding under the 2013 Plan.
 
 
Total
 
RSUs
 
Stock Options
 
 
Equity
Classified
 
Liability Classified
 
Outstanding as of December 31, 2015
 
1,006,436

 
501,634

 
329,802

 
175,000

Granted
 
2,145,066

 
1,754,868

 
—

 
390,198

Exercised/Issued
 
(7,642
)
 
(7,642
)
 
—

 
—

Forfeited
 
(140,857
)
 
(131,367
)
 
(9,490
)
 
—

Outstanding as of December 31, 2016
 
3,003,003

 
2,117,493

 
320,312

 
565,198
Issuance of Restricted Stock Units
the three years ended December 31, 2016, the Company issued the following RSU grants following their approval by the Board:
Year of Issuance:
 
RSUs
 
Weighted average grant date fair value
 
Weighted average vesting period (months)
2016
 
1,754,868

 
$
10.85

 
33.8
2015
 
453,260

 
24.55

 
54.6
2014
 
151,352

 
26.13

 
42.5
Schedule of RSUs Outstanding
As of December 31, 2016, the following equity classified RSUs were outstanding:
 
 
December 31, 2016
Vesting Conditions:
 
Outstanding
 
Expected to vest
 
Weighted average remaining service period (months)
 
Potential additional awards
Service-based
 
782,566

 
782,566

 
23.5
 
—

Performance-based
 
717,917

 
586,200

 
25.9
 
437,867

Market-based
 
617,010

 
617,010

 
30.9
 
1,182,109

Total
 
2,117,493

 
1,985,776

 
26.5
 
1,619,976
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
During the year ended December 31, 2016, the Company granted non-qualified stock options under the 2013 Plan as follows:
 
 
Stock Options
 
Weighted average strike price per share
 
Weighted average grant date fair value per share
Stock options granted
 
390,198

 
$
8.05

 
$
4.35
Valuation Assumptions for Option Grants
The following table provides the range of assumptions used in valuing the stock option grants using the Black-Scholes option pricing method:
 
 
Black-Scholes Input Assumptions
Weighted average expected term (years)
 
6.0
Expected volatility
 
53.0%
Risk-free rate
 
1.52% to 1.56%
Expected dividend rate
 
—%
Fair value price per share
 
$4.32 to $4.81