Incentive Based Compensation (Details)	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Stock Options
Beginning year stock option awards | shares	12,665,419
Granted stock option awards | shares	1,680,000	[1]
Exercised stock option awards | shares	0
Canceled stock option awards | shares	(181,681)
End of period stock option awards | shares	14,163,738
Beginning year weighted average exercise price	$ 29.97
Granted weighted average exercise price	7.22
Exercises weighted average exercise price	0.00
Canceled weighted average exercise price	29.69
End of period weighted average exercise price	27.27
Stock options weighted average grant date fair value	$ 1.97

[1] The weighted average grant date fair value of stock option awards granted was $1.97 per share.