Earnings per Share - Schedule of Reconciliation of the Numerators and Denominators of the Basic and Diluted Net Income Per Share Computations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income (loss) available to common stockholders	$ 37,704	$ 29,687	$ 95,355	$ (15,558)
Shares outstanding:
Weighted average shares outstanding – basic	77,522,664	76,902,070	77,445,611	63,821,705
Weighted average shares outstanding – diluted	78,283,588	77,959,689	78,208,040	63,821,705
Net income (loss) per common share attributable to common stockholders – basic:	$ 0.49	$ 0.39	$ 1.23	$ (0.24)
Net income (loss) per common share attributable to common stockholders – diluted:	$ 0.48	$ 0.38	$ 1.22	$ (0.24)
Stock Options
Shares outstanding:
Effect of dilutive securities	93,530	128,696	125,861
Restricted Stock Units (RSUs)
Shares outstanding:
Effect of dilutive securities	667,394	928,923	636,568