Stockholders' Equity - Reconciliation of Number of Shares of Common Stock (Details) - shares	6 Months Ended		17 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020
Stockholders Equity Note [Abstract]
Common stock, beginning of period	41,207,000	42,694,000
Shares of common stock issued upon lapse of restricted stock units (“RSUs”)	239,000	304,000
Common stock retired	(1,779,000)	(990,000)	(1,728,672)
Common stock, end of period	39,667,000	42,008,000	39,667,000