Stockholders' Equity - Reconciliation of Number of Shares of Common Stock (Details) - shares	9 Months Ended		14 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016
Stockholders Equity Note [Abstract]
Common stock, beginning of period	48,297,000	52,169,000
Shares issued upon the exercise of stock options	108,000	89,000
Shares of common stock issued upon lapse of restricted stock units ("RSUs")	426,000	407,000
Common stock retired	(2,869,000)	(4,094,000)	(3,831,300)
Common stock, end of period	45,962,000	48,571,000	45,962,000