Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock options granted and weighted-average grant-date fair value

The following table summarizes all stock option activity for the nine months endedSeptember 30, 2017:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)
Balance as of December 31, 2016	3,705,893		$	7.72	4.74
Granted	—		—
Exercised	—		—
Forfeited	(89,630	)	7.13
Vested options expired	(847,898	)	11.07
Balance as of September 30, 2017	2,768,365		6.72		5.10
Vested and expected to vest as of September 30, 2017	2,768,365		$	6.72	5.10
Exercisable as of September 30, 2017	2,003,764		$	7.59	3.73

Schedule of cash stock appreciation rights granted and weighted-average grant-date fair value

The following table summarizes all stock appreciation rights activity for the nine months endedSeptember 30, 2017:

	Number of Shares	Weighted Average Grant-Date Fair Value
Balance as of December 31, 2016	—	$	—
Granted	866,196	0.97
Vested	—	—
Forfeited	—	—
Cash stock appreciation rights outstanding at September 30, 2017	866,196	$	0.97

Schedule of unvested shares granted and weighted-average grant-date fair value

The following table summarizes all unvested share activity for the nine months endedSeptember 30, 2017:

	Number of Shares		Weighted Average Grant- Date Fair Value
Balance as of December 31, 2016	945,252		$	3.76
Granted	1,336,060		0.98
Vested	(405,241	)	4.13
Forfeited	(132,468	)	2.76
Unvested shares outstanding at September 30, 2017	1,743,603		$	1.61

Schedule of phantom shares granted and weighted-average grant-date fair value

The following table summarizes all phantom stock activity for the nine months endedSeptember 30, 2017:

	Number of Shares		Weighted Average Grant- Date Fair Value
Balance as of December 31, 2016	531,820		$	2.69
Granted	560,000		0.97
Settled	(125,046	)	2.69
Forfeited	(112,360	)	2.51
Phantom stock units outstanding at September 30, 2017	854,414		$	1.59

Schedule of performance shares granted and weighted-average grant-date fair value

The following table summarizes all performance stock unit activity for the nine months endedSeptember 30, 2017:

	Number of Shares		Weighted Average Grant- Date Fair Value
Balance as of December 31, 2016	844,315		$	2.56
Granted	711,268		0.99
Settled	—		—
Forfeited	(104,946	)	4.79
Performance stock units outstanding at September 30, 2017	1,450,637		$	1.63

Schedule of cash performance shares granted and weighted-average grant-date fair value

The following table summarizes all cash performance stock unit activity for the nine months endedSeptember 30, 2017:

	Number of Shares		Weighted Average Grant- Date Fair Value
Balance as of December 31, 2016	444,005		$	2.69
Granted	1,098,871		1.01
Settled	—		—
Forfeited	(37,784	)	2.69
Cash performance stock units outstanding at September 30, 2017	1,505,092		$	1.46