Share-Based Compensation - Employee Share-Based Compensation Plans (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)	800,000
2008 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)	800,000	590,000
Remaining shares available for grant under the plan (in shares)	1,600,318
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)	0	0
Remaining shares available for grant under the plan (in shares)	90,120