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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

Summary of stock option activity

The following summarizes all stock option activity during the years ended December 31, 2017, 2016, and 2015:

In thousands		Number of Shares			Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (Thousands)
Options outstanding at December 31, 2014		446,365			$	114.99
Granted in 2015		197,318			57.26
Exercised in 2015		(3,500	)		60.40						$	67
Unvested options forfeited in 2015		(65,982	)		79.59
Vested options expired in 2015		(113,988	)		148.83
Options outstanding at December 31, 2015		460,213			$	87.36
Granted in 2016		15,037			26.15
Exercised in 2016		—			—						$	—
Unvested options forfeited in 2016		(57,014	)		75.74
Vested options expired in 2016		(47,689	)		160.61
Options outstanding at December 31, 2016		370,547			$	77.23
Granted in 2017		33,855			10.00
Exercised in 2017		—			—						$	—
Unvested options forfeited in 2017		(9,872	)		73.31
Vested options expired in 2017		(85,563	)		110.44
Options outstanding at December 31, 2017		308,967			$	60.80			5.86		$	—
Vested and expected to vest at December 31, 2017		308,967			$	60.80			5.86		$	—
Exercisable at December 31, 2017		201,594			$	75.42			4.66		$	—

Summary of information of stock options outstanding

The following table summarizes information about stock options outstanding at December 31, 2017:

Range of Exercise Prices						Number Outstanding			Weighted-Average Exercise Price				Weighted-Average Remaining Life (Years)		Number Exercisable			Weighted-Average Exercise Price
$	0.00		-	29.99		48,892			$	14.97			9.39		3,759			$	26.15
$	30.00		-	54.99		96,866			38.39				7.73		48,433			38.39
$	55.00		-	79.99		94,903			70.27				3.96		85,785			69.57
$	80.00		-	104.99		30,941			88.28				5.34		26,253			89.35
$	105.00		-	129.99		22,900			119.73				2.23		22,900			119.73
$	130.00		-	159.99		14,465			151.51				0.70		14,465			151.51
						308,967			$	60.80			5.86		201,595			$	75.42

Schedule of weighted-average assumptions used to estimate fair value

The fair value of each option grant is estimated on the date of grant using the Black-Scholes Option-Pricing Model based on the following weighted-average assumptions used for grants during 2017, 2016, and 2015:

		Year Ended December 31,
		2017			2016			2015
Expected term (in years)		6.25			6.25			6.24
Expected stock price volatility		53.70	%		44.80	%		40.60	%
Risk-free interest rate		2.16	%		1.48	%		1.58	%
Expected dividend yield		—	%		—	%		5.69	%

Summary of cash stock appreciation rights

		Number of Units			Weighted- Average  Exercise Price				Weighted-Average Remaining Contractual Term (Years)
Cash stock appreciation rights outstanding at December 31, 2016		—			$	—
Granted in 2017		86,618			9.70
Exercised in 2017		—			—
Forfeited in 2017		—			—
Cash stock appreciation rights outstanding at December 31, 2017		86,618			$	9.70			9.48
Vested and expected to vest at December 31, 2017		86,618			$	9.70			9.48
Exercisable at December 31, 2017		—			$	—			0.00

Schedule of weighted average assumptions used to estimate fair value of cash stock appreciation rights

The fair value of each option grant is estimated on the date of grant using the Black-Scholes Option-Pricing Model based on the following weighted-average assumptions used for grants during 2017:

		2017
Expected term (in years)		6.25
Expected stock price volatility		54.45	%
Risk-free interest rate		2.23	%
Expected dividend yield		—	%

Summary of unvested share activity

The following summarizes all unvested share activity during 2017, 2016, and 2015:

		Number of Shares			Weighted- Average Grant Date Fair Value
Unvested shares outstanding at December 31, 2014		79,007			$	80.89
Granted in 2015		83,626			63.80
Vested in 2015		(50,507	)		82.27
Forfeited in 2015		(15,911	)		78.39
Unvested shares outstanding at December 31, 2015		96,215			$	65.69
Granted in 2016		74,192			26.32
Vested in 2016		(36,492	)		66.96
Forfeited in 2016		(39,372	)		57.79
Unvested shares outstanding at December 31, 2016		94,543			$	37.59
Granted in 2017		160,962			9.81
Vested in 2017		(40,979	)		41.39
Forfeited in 2017		(13,304	)		27.84
Unvested shares outstanding at December 31, 2017		201,222			$	15.23

Summary of phantom stock unit activity

The following summarizes all phantom stock unit activity during 2017:

		Number of Units			Weighted- Average Grant Date Fair Value
Phantom stock units outstanding at December 31, 2015		—			$	—
Granted in 2016		78,140			26.90
Vested in 2016		—			—
Forfeited in 2016		(24,976	)		26.90
Phantom stock units outstanding at December 31, 2016		53,164			$	26.90
Granted in 2017		56,000			9.70
Vested in 2017		(12,483	)		26.90
Forfeited in 2017		(14,644	)		22.63
Phantom stock units outstanding at December 31, 2017		82,037			$	15.92

Summary of performance stock unit activity

The following summarizes all performance stock unit activity during 2017, 2016, and 2015:

		Number of Units			Weighted- Average Grant-Date Fair Value
Performance stock units outstanding at December 31, 2014		60,363			$	76.07
Granted in 2015		66,982			43.02
Settled in 2015		—			—
Forfeited in 2015		(57,211	)		75.40
Performance stock units outstanding at December 31, 2015		70,134			$	45.05
Granted in 2016		47,300			19.00
Settled in 2016		—			—
Forfeited in 2016		(33,004	)		57.59
Performance stock units outstanding at December 31, 2016		84,430			$	25.56
Granted in 2017		89,124			9.95
Settled in 2017		—			—
Forfeited in 2017		(10,494	)		47.90
Performance stock units outstanding at December 31, 2017		163,060			$	15.59

Summary of cash performance unit activity

The following summarizes all performance stock unit activity during 2017:

		Number of Shares			Weighted- Average Grant-Date Fair Value
Cash performance stock units outstanding at December 31, 2015		—			$	—
Granted in 2016		51,209			26.90
Settled in 2016		—			—
Forfeited in 2016		(6,812	)		26.90
Cash performance stock units outstanding at December 31, 2016		44,397			$	26.90
Granted in 2017		109,887			10.10
Settled in 2017		—			—
Forfeited in 2017		(3,778	)		26.90
Cash performance stock units outstanding at December 31, 2017		150,506			$	14.63

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