Stock-based Compensation - Awards Granted (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards granted (in shares)	866,849	857,130
Performance-based stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards granted (in shares)	0	267,770
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards granted (in shares)	387,597	385,713