Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Restricted Stock Activity

A summary of restricted stock activity for the year ended December 31, 2016 is presented below:

	Number of Restricted Shares			Weighted Average Grant Price
Outstanding at January 1, 2016		314,048		$49.57
Granted		237,187		$5.46
Vested		(191,004	)	$58.80
Forfeitures		(5,245	)	$32.07
Outstanding at December 31, 2016		354,986		$15.60

Summary of Significant Assumptions Use to Value PSUs

Significant assumptions use to value PSUs in 2014, 2015 and 2016 included:

	For the Years Ended December 31,
	2014		2015		2016
Risk free interest rate		0.6%		1.1%		0.9%
Range of implied volatility:
Minimum		38%		37%		47%
Maximum		70%		65%		92%

Summary of PSU Activity

A summary of PSU activity for the year ended December 31, 2016 is presented below:

	Number of PSUs		Weighted Average Grant Price
Outstanding at January 1, 2016	133,931		$45.27
Granted	60,015		$7.00
Earned	(7,540	)	$21.90
Unearned or forfeited	(51,756	)	$64.40
Outstanding at December 31, 2016	134,650		$22.17

Stock Option Activity under Company's 2009 Long-term Incentive Plan

The following table summarizes information related to stock option activity under the Company's 2009 Long-term Incentive Plan for the year ended December 31, 2016:

	Number of Options			Weighted Average Exercise Price
Outstanding at January 1, 2016		11,730		$166.10
Expired		(11,730	)	$166.10
Outstanding at December 31, 2016		—		$—