Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

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

Stock-based compensation assumptions used in the option valuation models

The assumptions used in the model are outlined in the following table:

	Year Ended December 31,
	2014
Weighted average grant date fair value per share	$	106.08
Weighted average assumptions used:
Expected volatility	45		%
Expected life (in years)	6.25
Risk-free interest rate	1.98		%
Expected dividend yield	—		%

Stock option activity

The following table summarizes stock option activity during the years ended December 31, 2016, 2015 and 2014 (shares in thousands):

	Year Ended				Year Ended			Year Ended
	December 31, 2016				December 31, 2015			December 31, 2014
	Options		Weighted Average Exercise Price		Options	Weighted Average Exercise Price		Options	Weighted Average Exercise Price
Outstanding at beginning of period	130		$	218.46	130	$	218.46	129	$	218.38
Granted	—		$	—	—	$	—	1	$	229.84
Forfeited	(16	)	$	227.19	—	$	—	—	$	—
Outstanding at end of period (1)	114		$	217.24	130	$	218.46	130	$	218.46
Options exercisable at end of period (2)	85		$	203.48	93	$	202.48	88	$	199.50
Available for grant at end of period	26				10			10

⁽¹⁾  Stock options outstanding at December 31, 2016 have a weighted average remaining contractual term of 2.3 years and there is no intrinsic value.

⁽²⁾  Exercisable stock options at December 31, 2016 have a weighted average remaining contractual term of 1.3 years and there is no intrinsic value.