Stockholders' Equity - Reconciliation of Denominators used in Computation of Basic and Diluted Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stockholders' Equity Note [Abstract]
Basic weighted average shares outstanding (in shares)	288,918,945	291,176,985	288,863,482	293,191,566
Weighted shares assumed upon exercise of stock options (in shares)	200,525	653,152	268,820	678,586
Diluted weighted average shares outstanding (in shares)	289,119,470	291,830,137	289,132,302	293,870,152